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The Mental Health Continuum

Mental health is not a fixed label of 'healthy' or 'ill' — it exists on a continuum from thriving to struggling, and everyone moves along it over time depending on life circumstances, coping skills, and support.
  • Mental health includes emotional, psychological, and social well-being, and affects how a person thinks, feels, and acts
  • Good mental health does not mean the absence of hard feelings; it means having the tools to cope with them
  • Risk factors (trauma, chronic stress, family history, substance use) push someone toward the struggling end
  • Protective factors (supportive relationships, sleep, exercise, coping skills, sense of purpose) push someone toward thriving
  • A person can have a diagnosed mental illness and still function well with treatment and support
  • Checking in on your own mental state regularly is a normal, healthy habit, not a sign of weakness

Stress and the Body's Stress Response

Stress is the body's physical and emotional reaction to a demand or challenge. The 'fight-or-flight' response releases adrenaline and cortisol to prepare the body to react quickly, which is helpful short-term but harmful if triggered constantly.
  • Eustress is positive, motivating stress (like nervous excitement before a game); distress is negative stress that overwhelms coping ability
  • The fight-or-flight response increases heart rate, breathing rate, and blood sugar while diverting blood from digestion to muscles
  • Acute stress is short-term and resolves; chronic stress persists over weeks or months and wears down the body
  • Chronic stress is linked to headaches, high blood pressure, weakened immune function, sleep problems, and anxiety/depression
  • Common teen stressors include academic pressure, social relationships, family conflict, and social media comparison
  • Time management, physical activity, and talking to someone are proven ways to reduce the physical impact of stress

Emotions and Emotional Intelligence

Emotional intelligence (EQ) is the ability to recognize, understand, and manage your own emotions while also recognizing and responding well to the emotions of others.
  • Self-awareness means accurately naming what you feel and recognizing what triggers it
  • Self-management is choosing how to respond to an emotion rather than reacting impulsively
  • Empathy is the ability to understand and share another person's feelings without judgment
  • Social skills built on EQ include active listening, clear communication, and conflict resolution
  • All emotions (including anger, jealousy, sadness) are normal; it is the behavior that follows an emotion that can be healthy or unhealthy
  • Journaling, naming feelings out loud, and pausing before reacting all strengthen emotional intelligence over time

Healthy Coping Strategies and Resilience

Coping strategies are the specific actions people use to manage stress and difficult emotions. Resilience is the ability to adapt and bounce back after setbacks, and it can be built like a skill.
  • Healthy coping includes exercise, talking to a trusted person, deep breathing, creative outlets, and problem-solving
  • Unhealthy coping includes substance use, avoidance, self-harm, aggression, and social withdrawal — these provide short-term relief but worsen problems long-term
  • Resilience is built through supportive relationships, a growth mindset, realistic goal-setting, and practicing problem-solving under manageable stress
  • Cognitive reframing means changing how you interpret a stressful situation to reduce its emotional impact
  • A strong support network (family, friends, mentors, counselors) is one of the biggest predictors of resilience
  • Self-care — sleep, nutrition, physical activity, and downtime — is a foundation that makes all other coping strategies more effective

Anxiety and Depressive Disorders

Anxiety disorders and depression are the most common mental health conditions among teens. They are medical conditions involving changes in brain chemistry and function, not a choice or character flaw.
  • Generalized anxiety disorder involves excessive, hard-to-control worry most days for six months or more that interferes with daily life
  • Depression involves persistent sadness or loss of interest lasting two weeks or longer, along with changes in sleep, appetite, energy, or concentration
  • Both conditions have biological (brain chemistry, genetics), psychological, and environmental (stress, trauma) causes
  • Effective treatments include talk therapy (like cognitive behavioral therapy), medication, and lifestyle changes — often used in combination
  • Untreated anxiety and depression can affect school performance, relationships, and physical health
  • Stigma (negative stereotypes about mental illness) is a major reason people delay seeking treatment

Warning Signs and Seeking Help

Knowing the warning signs of a mental health crisis and how to respond can save a life. Suicide is preventable, and most people who consider it give some warning signs beforehand.
  • Warning signs include talking about wanting to die, giving away belongings, sudden calmness after depression, withdrawing from others, and reckless behavior
  • If you notice these signs in a friend, tell a trusted adult immediately — this is not betraying a secret, it is protecting a life
  • Directly and calmly asking someone 'Are you thinking about suicide?' does not plant the idea; it opens the door to help
  • 988 is the Suicide & Crisis Lifeline in the U.S., available 24/7 by call, text, or chat
  • School counselors, trusted adults, doctors, and mental health professionals are all appropriate resources for getting help
  • Recovery is possible with the right support — most people with mental health conditions improve significantly with treatment
All stress is harmful, not true — eustress (like excitement before a big game) is short-term stress that can improve focus and performance
Mental illness is a sign of personal weakness, not true — it is a medical condition involving brain chemistry, genetics, and environment, just like a physical illness
Asking someone directly if they're suicidal will give them the idea, not true — direct, caring questions open the door to help and do not increase risk
Keeping a friend's suicidal thoughts secret is loyalty, not true — telling a trusted adult immediately is the responsible, life-saving action

Macronutrients and Their Roles

Macronutrients are the nutrients the body needs in large amounts for energy and growth: carbohydrates, proteins, and fats. Each has a distinct job in the body.
  • Carbohydrates are the body's primary and preferred energy source, found in grains, fruits, vegetables, and legumes
  • Complex carbohydrates (whole grains, vegetables) digest slowly and provide steady energy; simple carbohydrates (sugar) digest quickly and spike blood sugar
  • Proteins build and repair tissue (including muscle) and are made of amino acids; sources include meat, fish, eggs, dairy, beans, and nuts
  • Fats provide long-term energy storage, support cell function, and help absorb fat-soluble vitamins (A, D, E, K)
  • Unsaturated fats (olive oil, nuts, avocado, fish) support heart health; saturated and trans fats, eaten in excess, raise heart disease risk
  • Each gram of carbohydrate or protein provides about 4 calories; each gram of fat provides about 9 calories

Micronutrients: Vitamins and Minerals

Micronutrients are vitamins and minerals needed in small amounts that support essential body functions like immunity, bone health, and energy metabolism.
  • Vitamin C supports immune function and wound healing; found in citrus fruits, peppers, and broccoli
  • Calcium and vitamin D work together to build and maintain strong bones and teeth
  • Iron carries oxygen in the blood; a deficiency causes anemia, leading to fatigue and weakness
  • B vitamins help convert food into usable energy at the cellular level
  • Most micronutrient needs can be met through a varied diet rich in fruits, vegetables, whole grains, and lean proteins
  • Water-soluble vitamins (like C and B vitamins) are not stored well and need regular replenishment; fat-soluble vitamins (A, D, E, K) are stored in body fat

MyPlate and Balanced Eating

MyPlate is the USDA's visual guide for building balanced meals, replacing the older food pyramid, and emphasizing portion balance across food groups.
  • MyPlate divides a plate into four sections: fruits, vegetables, grains, and protein, plus a side of dairy
  • Half the plate should be fruits and vegetables at most meals
  • Whole grains (brown rice, whole wheat bread, oats) are recommended over refined grains for more fiber and nutrients
  • Lean protein sources include poultry, fish, beans, eggs, and nuts
  • Portion control, not just food choice, matters for maintaining a healthy weight
  • Reading nutrition labels helps identify serving size, calories, added sugars, and sodium content

Components of Physical Fitness

Physical fitness has five key components, and a well-rounded fitness plan addresses all of them rather than just one.
  • Cardiorespiratory endurance is the heart and lungs' ability to supply oxygen during sustained activity (e.g., running, swimming)
  • Muscular strength is the maximum force a muscle can produce (e.g., lifting a heavy weight one time)
  • Muscular endurance is a muscle's ability to perform repeated contractions over time without fatigue (e.g., many push-ups)
  • Flexibility is the range of motion available at a joint, improved through stretching
  • Body composition is the ratio of fat mass to lean mass (muscle, bone, organs) in the body
  • The FITT principle (Frequency, Intensity, Time, Type) is used to design an effective, individualized exercise plan

Benefits of Regular Physical Activity

Regular physical activity benefits nearly every body system and is one of the most powerful tools for long-term health, both physical and mental.
  • The CDC recommends teens get at least 60 minutes of moderate-to-vigorous physical activity every day
  • Aerobic exercise strengthens the heart and lungs and reduces risk of heart disease, type 2 diabetes, and obesity
  • Resistance/strength training builds muscle and bone density, which is especially important during adolescent growth
  • Exercise releases endorphins, improving mood and reducing symptoms of stress, anxiety, and depression
  • Regular activity improves sleep quality and helps regulate a healthy body weight
  • Both aerobic and muscle-strengthening activities should be included across a week for balanced fitness

Body Image, Eating Disorders, and Healthy Weight Management

A healthy relationship with food and body image is essential; when it breaks down, it can lead to disordered eating patterns that require professional treatment.
  • Anorexia nervosa involves severe restriction of food intake driven by an intense fear of gaining weight and a distorted body image
  • Bulimia nervosa involves cycles of binge eating followed by purging (vomiting, laxatives, or excessive exercise)
  • Binge eating disorder involves recurrent episodes of eating large amounts of food with a feeling of loss of control, without purging
  • Eating disorders are serious mental illnesses with physical, psychological, and social causes — they are not simply about vanity
  • Healthy weight management focuses on balanced nutrition and regular activity, not extreme dieting or fasting
  • Media and social media images are often edited or filtered, contributing to unrealistic body standards
'Fat-free' means healthy, not true — fat-free foods often add sugar to make up for lost flavor, so the label alone doesn't guarantee it's healthier
Skipping meals is an effective way to lose weight, not true — it often leads to overeating later and can slow metabolism
Eating disorders are a lifestyle choice about vanity, not true — they are serious mental illnesses with biological, psychological, and social roots
All fats are bad for you, not true — unsaturated fats (nuts, olive oil, fish) support heart health, while saturated/trans fats in excess raise risk

Categories of Drugs and How They Affect the Body

Drugs are classified by how they affect the central nervous system: depressants, stimulants, and hallucinogens each produce different effects on mood, perception, and body function.
  • Depressants (alcohol, opioids, benzodiazepines) slow down central nervous system activity, causing relaxation, slowed breathing, and impaired coordination
  • Stimulants (nicotine, cocaine, methamphetamine, excess caffeine) speed up the central nervous system, increasing heart rate, alertness, and blood pressure
  • Hallucinogens (LSD, psilocybin) alter perception, thoughts, and feelings, causing sensory distortions
  • Tolerance is needing more of a substance over time to get the same effect
  • Physical dependence occurs when the body adapts to a substance and experiences withdrawal symptoms without it
  • Addiction is a chronic brain disease involving compulsive substance use despite harmful consequences

Alcohol: Effects and Risks

Alcohol is a depressant that impairs judgment, coordination, and reaction time, and its effects are especially harmful to the developing adolescent brain.
  • Alcohol impairs the frontal lobe first, affecting judgment and decision-making before physical coordination
  • Blood alcohol concentration (BAC) rises with each drink and is affected by body weight, sex, and how quickly alcohol is consumed
  • Binge drinking (4+ drinks for females, 5+ for males in about two hours) sharply raises the risk of alcohol poisoning
  • Alcohol poisoning can cause vomiting, unconsciousness, slowed breathing, and death; a person showing these signs needs emergency medical help
  • The teen brain, especially the prefrontal cortex, is still developing until the mid-20s, making it more vulnerable to alcohol's damaging effects
  • Long-term heavy alcohol use is linked to liver disease, certain cancers, and addiction

Nicotine, Vaping, and Tobacco

Nicotine is a highly addictive stimulant found in cigarettes, e-cigarettes/vapes, and other tobacco products, and it is especially harmful to the developing adolescent brain.
  • Nicotine reaches the brain within seconds of inhalation and rapidly creates dependence, especially in teens
  • Vaping (e-cigarettes) delivers nicotine along with heated chemicals and flavorings; despite marketing, it is not a harmless alternative to smoking
  • Combustible cigarette smoke contains thousands of chemicals, including tar and carbon monoxide, and dozens of known carcinogens
  • Long-term tobacco use is the leading preventable cause of death in the U.S., linked to lung cancer, heart disease, and COPD
  • Nicotine exposure during adolescence can affect brain development related to attention, learning, and impulse control
  • Secondhand smoke exposes non-smokers to many of the same harmful chemicals

Marijuana and Other Illicit Drugs

Marijuana (cannabis) and other illicit drugs carry health and legal risks, and their effects vary widely by substance, dose, and the user's age.
  • THC, the main psychoactive compound in marijuana, affects memory, coordination, reaction time, and judgment
  • Regular marijuana use during adolescence is linked to impaired memory and learning, since the brain is still developing
  • Opioids (prescription painkillers and heroin) are highly addictive depressants that can cause fatal respiratory depression in overdose
  • Prescription drug misuse (taking medication not prescribed to you, or more than prescribed) carries the same risks as illegal drug use
  • Fentanyl, a powerful synthetic opioid, is increasingly mixed into other drugs, dramatically raising overdose risk even in small amounts
  • Naloxone (Narcan) can reverse an opioid overdose if administered quickly

Why People Use Substances and Risk/Protective Factors

Understanding why people begin using substances helps identify effective prevention strategies, since risk rarely comes from a single cause.
  • Common risk factors include peer pressure, curiosity, stress, family history of addiction, and easy access to substances
  • Protective factors include strong family bonds, clear rules and expectations, positive peer groups, and involvement in school or extracurricular activities
  • Peer pressure can be direct (explicitly urging someone) or indirect (wanting to fit in without being asked)
  • Refusal skills — clearly saying no, suggesting an alternative, and being ready to leave a situation — reduce the likelihood of giving in to pressure
  • Media and advertising can normalize substance use, especially alcohol and vaping, through appealing imagery
  • Early use of any substance increases the statistical risk of developing dependence later in life

Addiction as a Disease and Paths to Recovery

Addiction is recognized by medical science as a chronic disease of the brain's reward system, not a moral failing, and recovery is possible with proper treatment and support.
  • Addiction changes brain chemistry, particularly the dopamine reward pathway, reinforcing compulsive use despite negative consequences
  • Withdrawal symptoms occur when a physically dependent person stops using a substance, and can range from mild to medically dangerous
  • Effective treatment often combines behavioral therapy, support groups, and sometimes medication-assisted treatment
  • Relapse is common in recovery and does not mean treatment has failed; it often signals a need to adjust the treatment plan
  • Supportive, non-judgmental relationships significantly improve the likelihood of successful long-term recovery
  • Prevention programs that build refusal skills and healthy coping strategies reduce the likelihood of substance use starting in the first place
Vaping is a harmless alternative to smoking, not true — vapes deliver addictive nicotine plus heated chemicals and are not proven safe
Marijuana is completely harmless because it's 'natural,' not true — THC impairs memory, coordination, and judgment, especially in the developing teen brain
Addiction is just a lack of willpower, not true — it is a chronic brain disease that changes the dopamine reward pathway and requires treatment
Prescription drugs are always safe because a doctor prescribes them, not true — taking them differently than prescribed or using someone else's prescription carries real risks

Puberty and Adolescent Development

Puberty is the biological process during which the body matures sexually and physically, triggered by hormones, and it brings physical, emotional, and social changes.
  • Puberty is triggered by increased production of hormones — estrogen and progesterone in females, testosterone in males
  • Physical changes in females include breast development, onset of menstruation, and growth spurts
  • Physical changes in males include voice deepening, facial/body hair growth, and growth spurts
  • Puberty typically begins between ages 8-13 in females and 9-14 in males, though timing varies widely and normally
  • Emotional changes during puberty include mood swings, increased self-consciousness, and a growing desire for independence
  • The brain, especially the prefrontal cortex responsible for judgment and impulse control, continues developing into the mid-20s

The Reproductive Systems

The male and female reproductive systems each have specific organs and functions related to producing offspring, and understanding them is essential for making informed health decisions.
  • The female reproductive system includes the ovaries (produce eggs and hormones), fallopian tubes, uterus, and vagina
  • The menstrual cycle is roughly a 28-day hormonal cycle involving ovulation (egg release) and, if no fertilization occurs, menstruation
  • The male reproductive system includes the testes (produce sperm and testosterone), epididymis, vas deferens, and penis
  • Fertilization occurs when a sperm cell joins with an egg cell, typically in the fallopian tube
  • Regular check-ups and understanding one's own body are part of responsible reproductive health care
  • Both systems are regulated by hormones released from the brain's pituitary gland

Pregnancy and Prenatal Development

Pregnancy involves the development of a fertilized egg into a fetus over approximately 40 weeks, divided into three trimesters, each with distinct developmental milestones.
  • The first trimester (weeks 1-12) is when major organs and body systems begin to form, making it a critical period for avoiding harmful substances
  • The second trimester (weeks 13-27) involves rapid growth, and movement can typically be felt by the mother
  • The third trimester (weeks 28-40) is focused on continued growth and organ maturation in preparation for birth
  • Prenatal care (regular medical checkups during pregnancy) helps monitor the health of both mother and baby
  • Substances like alcohol, tobacco, and certain drugs can cause serious birth defects or developmental problems if used during pregnancy
  • Fetal alcohol spectrum disorders (FASDs) result from alcohol exposure during pregnancy and can cause lifelong physical and cognitive effects

Sexually Transmitted Infections and Prevention

Sexually transmitted infections (STIs) are infections passed primarily through sexual contact, and understanding transmission and prevention is a core part of reproductive health education.
  • Common STIs include chlamydia, gonorrhea, syphilis, HPV, herpes, and HIV, each with different symptoms and treatments
  • Many STIs, especially chlamydia and HPV, often cause no symptoms, which is why regular testing is important for sexually active individuals
  • Abstinence (choosing not to have sex) is the only 100% effective method to prevent STIs and pregnancy
  • Condoms, when used correctly and consistently, significantly reduce (but do not eliminate) the risk of STI transmission
  • Untreated STIs can lead to serious complications, including infertility, and some (like HIV) are lifelong conditions
  • HPV vaccination can prevent infection with the strains of HPV most linked to cervical and other cancers

Contraception and Responsible Decision-Making

Contraception refers to methods used to prevent pregnancy, and understanding the range of options — along with their effectiveness — supports informed, responsible decision-making.
  • Abstinence is the only method with zero risk of pregnancy or STI transmission from sexual contact
  • Barrier methods (like condoms) block sperm from reaching an egg and also reduce STI transmission risk
  • Hormonal methods (like birth control pills) prevent pregnancy by regulating hormones to prevent ovulation, but do not protect against STIs
  • No method other than abstinence is 100% effective at preventing pregnancy
  • Responsible decision-making includes considering physical, emotional, legal, and future-goal consequences before becoming sexually active
  • Open communication with a trusted adult or healthcare provider supports informed choices about reproductive health

Family Life, Parenting Readiness, and Life Stages

Human development continues across the lifespan, and understanding the stages of life — along with the responsibilities of parenting — helps build realistic expectations for the future.
  • Erikson's stages of psychosocial development describe key challenges faced at each life stage, from infancy through late adulthood
  • Adolescence is a stage focused on identity development — figuring out values, goals, and a sense of self
  • Responsible parenting requires emotional maturity, financial stability, and a strong support system — readiness that most teens have not yet reached
  • Teen pregnancy carries increased health risks for both the parent and baby, and significant social and financial challenges
  • Healthy family relationships are built on communication, respect, and shared responsibilities
  • Life stages (infancy, childhood, adolescence, adulthood, older adulthood) each bring distinct physical, cognitive, and social developmental tasks
You can tell if someone has an STI just by looking at them, not true — many STIs show no visible symptoms at all
Birth control pills protect against STIs, not true — hormonal methods prevent pregnancy but provide no protection against sexually transmitted infections
Puberty happens at the exact same age and pace for everyone, not true — timing and pace vary widely and normally between individuals
A condom is 100% effective at preventing pregnancy and STIs, not true — used correctly it greatly reduces risk, but only abstinence is 100% effective

Treating Common Injuries: RICE and Beyond

Most sports and activity injuries — sprains, strains, and minor fractures — respond well to prompt, correct first aid, and knowing the difference between injury types determines the right response.
  • A sprain is a stretched or torn ligament (connects bone to bone); a strain is a stretched or torn muscle or tendon (connects muscle to bone)
  • RICE stands for Rest, Ice, Compression, and Elevation — the standard first 24-48 hour treatment for most sprains and strains
  • Ice should be wrapped in a cloth, never applied directly to skin, and used for about 15-20 minutes at a time to avoid frostbite
  • Signs of a possible fracture include deformity, inability to bear weight, intense localized pain, and swelling — the area should be immobilized, not straightened
  • A person with a suspected head, neck, or spinal injury should not be moved unless there is immediate danger, since movement can worsen spinal damage
  • Applying heat is appropriate for muscle stiffness after the first 48 hours, not for a fresh injury, since heat increases swelling early on

CPR, AEDs, and Responding to Choking

Cardiac arrest and choking are life-threatening emergencies where bystander action in the first few minutes dramatically affects survival, and basic steps can be learned by anyone.
  • The Cardiac Chain of Survival includes early recognition and calling 911, early CPR, early defibrillation (AED), and early advanced care
  • Hands-only CPR for an unresponsive adult who isn't breathing normally involves calling 911, then pushing hard and fast in the center of the chest at 100-120 compressions per minute
  • An AED (automated external defibrillator) talks the user through each step and will only deliver a shock if it detects a shockable heart rhythm
  • For a choking adult who cannot cough, speak, or breathe, abdominal thrusts (the Heimlich maneuver) are used to try to dislodge the object
  • Brain damage from lack of oxygen can begin within about 4-6 minutes, which is why calling 911 immediately and starting CPR without delay matters so much
  • Good Samaritan laws generally protect bystanders who provide reasonable emergency help in good faith from being sued if something goes wrong

Motor Vehicle and Pedestrian Safety

Motor vehicle crashes are the leading cause of death for U.S. teenagers, and most of the risk factors involved are preventable through specific behavior changes.
  • Seatbelts reduce the risk of fatal injury in a crash by roughly half and should be worn on every ride, including short trips
  • Distracted driving (texting, eating, adjusting music) slows reaction time similarly to driving impaired, even with hands-free devices
  • Driving under the influence of alcohol or drugs impairs judgment, reaction time, and coordination, and is illegal at any measurable level for drivers under 21 in most states
  • Graduated driver's licensing (GDL) programs restrict new teen drivers' nighttime driving and number of passengers because both significantly raise crash risk
  • Pedestrians should cross at marked crosswalks, make eye contact with drivers, and stay visible (reflective clothing, lights) at night
  • Cyclists should wear a properly fitted helmet, ride with traffic flow, and use hand signals, since helmets significantly reduce the risk of serious head injury

Water, Weather, and Recreational Safety

Environmental hazards like water, extreme heat, extreme cold, and severe weather cause preventable injuries and deaths every year, especially during outdoor recreation.
  • Drowning can happen silently and quickly, often without the splashing or shouting shown in movies, which is why constant, undistracted supervision near water matters
  • Never swim alone; swim in areas supervised by a lifeguard when possible, and always check current and rip current conditions before entering open water
  • Heat exhaustion (heavy sweating, weakness, nausea) can progress to heat stroke (high body temperature, confusion, hot/dry skin), which is a life-threatening emergency requiring immediate cooling and 911
  • Hypothermia occurs when body temperature drops dangerously low from cold exposure, causing shivering, confusion, and slurred speech as it worsens
  • During lightning, the safest action is to get indoors or into a hard-topped vehicle; being in open fields, under trees, or in water are all high-risk locations
  • Wearing a properly fitted life jacket, rather than relying on swimming ability alone, is the most effective way to prevent drowning during boating

Violence Prevention and Personal Safety

Preventing violence — from bullying to weapons-related incidents — relies on recognizing warning signs early, defusing conflict, and knowing when and how to get help.
  • Bullying includes physical, verbal, social, and cyberbullying, and involves a repeated, intentional imbalance of power, not just a single disagreement
  • Bystanders who speak up, support the target, or report bullying to an adult significantly reduce how long bullying continues
  • De-escalation strategies include staying calm, using a non-threatening tone, giving the other person space, and walking away from an escalating situation when possible
  • Access to firearms is a major risk factor for both suicide and unintentional injury; a safely stored, unloaded firearm separate from ammunition significantly reduces this risk
  • Warning signs of a young person at risk for violence include sudden behavior changes, talk of hurting themselves or others, and social withdrawal
  • A home fire escape plan with two ways out of every room and a designated meeting spot should be practiced regularly, since most fatal home fires happen at night

Emergency Preparedness and the EMS System

Knowing how to activate the emergency medical system (EMS) and prepare for likely local disasters turns a bystander into an effective first responder.
  • Calling 911 connects a caller to a dispatcher who can send police, fire, or EMS, and the caller should stay on the line and answer all questions calmly
  • Universal precautions — using gloves and avoiding contact with blood or bodily fluids — protect both the helper and the injured person from infection
  • A basic first aid kit should include bandages, gauze, antiseptic, tape, gloves, and any personal medications a family member needs
  • Disaster plans should be specific to regional risks (earthquake, tornado, hurricane, wildfire) and include an emergency kit with water, food, and a flashlight
  • The 'check, call, care' model — check the scene and victim for danger, call 911, then provide the care you're trained for — is the basic framework for any emergency response
  • Knowing your exact address and location is critical information to give a 911 dispatcher immediately, since responders cannot help if they can't find you
Hands-free texting or calls while driving are just as safe as not using a phone, not true — both divert attention and slow reaction time similarly to handheld use
You should always try to straighten or realign a suspected broken bone, not true — the area should be immobilized as found, not straightened
Applying ice directly to bare skin speeds healing, not true — direct ice contact for extended periods can cause frostbite; always use a cloth barrier
Drowning always looks dramatic, with lots of splashing and yelling, not true — it is often silent and quick, which is why constant supervision near water is essential

Communicable vs. Noncommunicable Disease

Diseases fall into two broad categories based on whether they can spread from person to person, and the prevention strategy for each is very different.
  • Communicable (infectious) diseases are caused by pathogens (bacteria, viruses, fungi, parasites) and can spread between people, like the flu or strep throat
  • Noncommunicable diseases are not spread from person to person and are usually caused by genetics, lifestyle, or environmental factors, like heart disease or type 2 diabetes
  • Chronic diseases (like heart disease and diabetes) develop and persist over a long period, while acute diseases (like a cold) come on quickly and resolve
  • Noncommunicable diseases account for the majority of deaths in the U.S., many of which are linked to preventable risk factors like smoking, inactivity, and poor diet
  • Some diseases, like certain cancers linked to HPV, blur the line by having an infectious cause but a noncommunicable, chronic course
  • Public health tracks disease patterns; an epidemic is a disease spreading rapidly in a specific area, while a pandemic is a global outbreak

How Pathogens Spread and the Immune System's Defense

Understanding how pathogens travel from person to person, and how the immune system fights them off, explains why hygiene practices and vaccines work.
  • Pathogens spread through direct contact, respiratory droplets (coughing/sneezing), contaminated food or water, and vector-borne routes (like mosquitoes or ticks)
  • The body's first line of defense is physical barriers — skin, mucous membranes, and stomach acid — that block pathogens from entering
  • White blood cells are the immune system's second and third lines of defense, engulfing pathogens and producing antibodies that target specific invaders
  • Antibodies are proteins that recognize and bind to a specific pathogen, marking it for destruction and neutralizing it
  • After an infection, memory cells remain in the body, allowing a faster, stronger immune response if the same pathogen appears again
  • A fever is often a helpful immune response — raising body temperature makes the environment less favorable for many pathogens to reproduce

Vaccines and Herd Immunity

Vaccines train the immune system to recognize a pathogen without causing the disease itself, and when enough of a population is vaccinated, it protects even those who cannot be.
  • A vaccine introduces a weakened, inactivated, or partial form of a pathogen (or instructions to build a piece of it) so the immune system builds memory cells without a real infection
  • Herd immunity occurs when a high enough percentage of a population is immune, which slows or stops disease spread and protects people who can't be vaccinated (infants, immunocompromised people)
  • Common childhood and adolescent vaccines protect against diseases like measles, whooping cough, HPV, and meningitis
  • Vaccines undergo extensive testing for safety and effectiveness before approval, and ongoing monitoring continues after release
  • Declining vaccination rates in a community can allow previously rare diseases, like measles, to reemerge in outbreaks
  • Vaccines do not cause the disease they protect against; mild, short-term side effects (soreness, low fever) are signs the immune system is responding, not signs of illness

Cardiovascular Disease and Cancer Risk Factors

Cardiovascular disease and cancer are leading noncommunicable causes of death, and many of their risk factors are modifiable through lifestyle choices.
  • Cardiovascular disease includes conditions like heart disease and stroke, often caused by atherosclerosis — a buildup of plaque that narrows arteries
  • Modifiable cardiovascular risk factors include smoking, physical inactivity, poor diet, high blood pressure, and high cholesterol
  • Non-modifiable risk factors include age, family history, and genetics, which is why family health history matters even with a healthy lifestyle
  • Cancer occurs when cells grow and divide uncontrollably, and risk factors include tobacco use, excess UV exposure, certain infections (like HPV), and family history
  • Regular screenings (like skin checks, mammograms, or Pap tests as recommended by age) allow many cancers to be caught early, when treatment is most effective
  • Not all risk factors guarantee disease, and having no risk factors doesn't guarantee immunity — risk factors change probability, not certainty

Chronic Disease Prevention Through Lifestyle

Many of the most common chronic diseases share the same small set of preventable lifestyle risk factors, which means the same healthy habits protect against multiple diseases at once.
  • Regular physical activity lowers the risk of heart disease, type 2 diabetes, obesity, and some cancers
  • A diet high in fruits, vegetables, whole grains, and lean protein — and lower in processed foods, added sugar, and sodium — reduces risk for multiple chronic diseases
  • Not smoking or vaping is one of the single most effective steps to reduce risk of cancer, heart disease, and lung disease
  • Managing stress and getting adequate sleep support immune function and reduce the physical toll linked to chronic disease
  • Type 2 diabetes, unlike type 1, is strongly linked to lifestyle factors like inactivity and excess body weight, and can often be prevented or delayed
  • Routine checkups allow a doctor to catch early warning signs (like rising blood pressure or blood sugar) before they become a diagnosed disease

Hygiene Practices That Prevent Illness

Simple, consistent hygiene habits break the chain of infection at the point of transmission and are among the most effective, low-cost tools for preventing communicable disease.
  • Washing hands with soap and water for at least 20 seconds, especially before eating and after using the bathroom, is one of the most effective ways to prevent illness
  • Covering a cough or sneeze with the elbow (not the hands) reduces the spread of respiratory droplets to surfaces and other people
  • Staying home when sick with a contagious illness protects others, especially those at higher risk like infants, older adults, and immunocompromised people
  • Properly cooking food to safe internal temperatures and refrigerating perishables promptly prevents foodborne illness from bacteria like Salmonella and E. coli
  • Not sharing personal items like water bottles, utensils, or towels reduces the spread of pathogens that live in saliva or on skin
  • Cleaning and disinfecting frequently touched surfaces (doorknobs, phones, desks) reduces the chance of picking up pathogens that survive outside the body
Vaccines can give you the disease they protect against, not true — mild side effects like soreness or low fever are signs of an immune response, not illness
If you have no family history of a disease, lifestyle habits don't matter, not true — modifiable risk factors like diet, activity, and smoking affect risk regardless of genetics
Antibiotics work against viruses like the cold or flu, not true — antibiotics only treat bacterial infections, not viral ones
You can't spread an illness if you feel fine, not true — many pathogens are contagious during an incubation period before symptoms appear

Being a Critical Health Consumer

Health consumers are constantly targeted by advertising and health claims, and evaluating those claims critically protects both wallets and well-being.
  • Health fraud (quackery) involves selling products or services with false or exaggerated health claims, often targeting people desperate for a quick fix
  • Red flags for a health scam include promises of a 'miracle cure,' claims a product is suppressed by the medical establishment, and 'too good to be true' before-and-after results
  • Advertisers use techniques like testimonials, bandwagon appeals ('everyone's using it'), and appeals to fear or vanity to influence buying decisions
  • Checking a claim against a credible source (a doctor, the FDA, or a peer-reviewed study) before acting on it is a core critical-consumer skill
  • The FDA regulates the safety and labeling claims of food, drugs, and cosmetics, but dietary supplements are regulated far less strictly than medications
  • Comparing ingredients, cost per use, and independent reviews — rather than packaging or celebrity endorsement — leads to better health purchasing decisions

Understanding Health Insurance and Healthcare Costs

Health insurance is a system for sharing the financial risk of medical costs, and understanding its basic vocabulary helps people make informed healthcare decisions.
  • A premium is the regular amount paid (often monthly) to have health insurance, regardless of whether care is used that month
  • A deductible is the amount a person must pay out-of-pocket for covered services before insurance starts paying its share
  • A copay is a fixed amount paid for a specific service (like a doctor's visit), while coinsurance is a percentage of the cost shared between patient and insurer
  • Preventive care (like annual checkups and many vaccines) is often covered at no additional cost because it catches problems early and reduces long-term costs
  • An emergency room visit is far more expensive than an urgent care or primary care visit and should be reserved for true emergencies
  • Being uninsured or underinsured can lead people to delay care, which often makes conditions more serious and more expensive to treat

Choosing Healthcare Providers and Services

Different healthcare needs call for different types of providers and settings, and knowing which to use saves time, money, and gets more appropriate care.
  • A primary care provider manages overall health, routine checkups, and referrals to specialists when needed
  • Specialists (like a dermatologist or cardiologist) focus on a specific body system or condition and typically require a referral or specific need
  • Urgent care centers handle non-life-threatening issues that need prompt attention (minor cuts, infections), while emergency rooms are for life-threatening conditions
  • Mental health providers (counselors, therapists, psychiatrists) address emotional and psychological health, and psychiatrists specifically can prescribe medication
  • Checking a provider's credentials, reviews, and whether they're in-network with an insurance plan are practical steps before choosing care
  • Telehealth (virtual appointments) has expanded access to care, particularly for mental health and follow-up visits, though it isn't appropriate for every situation

Public Health Agencies and Their Roles

A network of government agencies at the local, national, and global level works to protect community health through research, regulation, and response.
  • The CDC (Centers for Disease Control and Prevention) tracks disease outbreaks, issues public health guidance, and conducts research on health threats within the U.S.
  • The FDA (Food and Drug Administration) regulates the safety of food, prescription and over-the-counter drugs, vaccines, and medical devices
  • The WHO (World Health Organization) coordinates global public health efforts, tracks disease across countries, and can declare a Public Health Emergency of International Concern
  • Local and state health departments handle community-level needs: restaurant inspections, immunization clinics, and disease outbreak investigation
  • The EPA (Environmental Protection Agency) sets and enforces standards for air and water quality that directly affect community health
  • These agencies rely on data collection and surveillance to detect health trends early, allowing faster public health responses

Environmental Health and Community Resources

The environment where people live, work, and go to school directly shapes health outcomes, and communities can act collectively to reduce environmental health risks.
  • Air pollution (from vehicles, industry, or wildfire smoke) is linked to asthma, cardiovascular disease, and other respiratory conditions
  • Water quality standards, testing, and treatment protect communities from contaminants like lead and harmful bacteria
  • 'Food deserts' are areas with limited access to affordable, healthy food, which is linked to poorer diet quality and higher chronic disease rates
  • Access to safe parks, sidewalks, and recreational spaces affects how much physical activity a community can realistically get
  • Environmental justice recognizes that pollution and health hazards are often unevenly distributed, disproportionately affecting lower-income communities
  • Community health resources like free clinics, food banks, and school-based health centers help fill gaps for people with limited access to care

Health Advocacy and Community Health Promotion

Health advocacy means taking action to support health at a personal, community, or policy level, and it's a skill anyone can build regardless of age.
  • Advocacy can range from personal (asking a doctor clear questions) to community-level (organizing a health fair) to policy-level (supporting a public health law)
  • Health campaigns use messaging strategies — like clear calls to action and relatable messengers — to change community behavior (e.g., anti-vaping campaigns)
  • Peer health education, where trained students teach other students, is an effective way to spread accurate health information within a community
  • Being a credible advocate means using accurate, current information from reliable sources rather than opinion or rumor
  • Community health promotion efforts (immunization drives, mental health awareness weeks) work best when tailored to a community's specific needs and culture
  • Voting and civic engagement are also forms of health advocacy, since many policies (clean air rules, school lunch standards) directly affect public health
'Natural' or 'FDA-approved' on a supplement label guarantees it's safe and effective, not true — supplements face much lighter regulation than medications
Going to the ER for any medical concern is always the right call, not true — non-emergencies are better and more affordably handled at urgent care or a primary provider
A higher premium always means better coverage, not true — plans vary widely in deductibles, copays, and networks, so total cost depends on the whole plan
Public health agencies only matter during a crisis, not true — they do ongoing work like restaurant inspections, immunization programs, and water quality monitoring year-round

Characteristics of Healthy vs. Unhealthy Relationships

All relationships — friendships, family, and romantic — fall somewhere on a spectrum from healthy to unhealthy to abusive, and recognizing the pattern matters more than any single incident.
  • Healthy relationships are built on mutual respect, trust, honesty, equality, and support for each person's individuality and other relationships
  • Unhealthy relationships often involve some controlling behavior, dishonesty, or disrespect, but haven't escalated to abuse
  • Warning signs of an unhealthy dynamic include extreme jealousy, checking a partner's phone without permission, and pressuring someone to change who they spend time with
  • A healthy relationship allows both people to maintain outside friendships and interests rather than expecting one person to meet all social needs
  • Respecting a partner's or friend's boundaries — even when you disagree with them — is a core sign of a healthy relationship
  • Relationships can shift between healthy and unhealthy over time; noticing the shift early makes it easier to address

Communication Skills and Conflict Resolution

Conflict is a normal part of any relationship; what determines whether a relationship stays healthy is how the people involved communicate through it.
  • Active listening means fully focusing on the speaker, not planning your response while they're talking, and reflecting back what you heard
  • 'I' statements (e.g., 'I feel frustrated when...') express a concern without blaming, which reduces defensiveness compared to 'you' statements
  • Nonverbal communication — tone, facial expression, body language — often carries as much meaning as the words being said
  • Healthy conflict resolution focuses on the specific issue at hand rather than bringing up unrelated past grievances or attacking the other person's character
  • Compromise means both people give a little to reach a solution both can accept, rather than one person always winning the disagreement
  • Taking a short break when a conversation gets too heated, then returning to it calmly, prevents conflicts from escalating into harmful arguments

Setting Boundaries and Understanding Consent

Boundaries are the limits a person sets for what they are and are not comfortable with, and consent is the clear, ongoing agreement required before any shared activity, especially physical intimacy.
  • A boundary can be physical, emotional, or digital (like not sharing private messages), and healthy relationships respect all three
  • Consent must be freely given, reversible, informed, enthusiastic, and specific (sometimes remembered as F.R.I.E.S.)
  • Consent to one activity is not consent to another, and consent given once is not consent for every future time
  • A person who is asleep, unconscious, or impaired by alcohol or drugs cannot legally or ethically give consent
  • Silence or the absence of 'no' is not the same as a 'yes' — clear, active agreement is required
  • Communicating boundaries clearly and directly, and respecting them when someone else states theirs, is a learnable skill that strengthens trust

Recognizing and Responding to Abuse

Abuse in a relationship can be physical, emotional, sexual, or digital, and recognizing early warning signs — in your own relationship or a friend's — is critical to getting help before harm escalates.
  • Physical abuse involves hitting, pushing, or any physical harm; emotional abuse involves manipulation, humiliation, isolation, or threats
  • Digital abuse includes constant monitoring, demanding passwords, or pressuring someone through texts and social media
  • The cycle of abuse often includes a tension-building phase, an incident, then a 'honeymoon' phase of apology and calm — which can make leaving feel confusing or difficult
  • Warning signs in a friend's relationship include isolation from friends and family, unexplained injuries, extreme secrecy, or sudden personality changes
  • Leaving an abusive relationship is often the most dangerous time, so safety planning with a trusted adult, counselor, or hotline is important rather than acting alone
  • The National Domestic Violence Hotline and school counselors are confidential resources available to anyone in or worried about an abusive relationship

Peer Pressure and Assertiveness

Peers strongly influence adolescent decision-making, and assertive communication is the key skill that allows someone to stay true to their values under social pressure.
  • Peer pressure can be positive (encouraging healthy habits) or negative (pushing risky behavior), and it can be direct (explicitly urging) or indirect (implied expectation)
  • Assertive communication expresses your own needs and opinions clearly and respectfully, without being passive (avoiding conflict at your own expense) or aggressive (disrespecting others)
  • Refusal skills include saying no clearly, offering an alternative, using humor to deflect, and being willing to leave a situation
  • Having at least one planned exit strategy (a text code word, a ride arranged in advance) makes it easier to leave an uncomfortable situation without confrontation
  • Surrounding yourself with peers who share your values reduces the frequency and intensity of negative peer pressure you'll face
  • Assertiveness is a skill that improves with practice, and role-playing difficult conversations in advance builds confidence to use it in the moment

Family Relationships and Support Systems

Family relationships, whatever form they take, are often a person's first and most enduring support system, and the same principles of healthy communication apply within them.
  • Families take many forms — nuclear, single-parent, blended, extended, or chosen family — and healthy family function depends on the relationships within it, not its structure
  • Healthy family communication includes expressing needs directly, listening without immediately reacting, and resolving conflict without contempt or stonewalling
  • Adolescence often includes natural friction with parents/guardians as teens seek more independence, which is a normal developmental process, not a sign of family failure
  • A strong support system — family, friends, mentors, or community — is one of the most protective factors for mental health and resilience through difficult times
  • Setting appropriate boundaries with family members (like privacy or personal space) can be done respectfully while still maintaining closeness
  • When family conflict becomes severe or unsafe, school counselors, family therapists, or trusted adults outside the family can provide support and mediation
If someone doesn't say 'no,' that means they've consented, not true — consent requires clear, active, enthusiastic agreement, not just the absence of refusal
Jealousy is proof that a partner really cares, not true — extreme jealousy and controlling behavior are warning signs of an unhealthy or abusive dynamic, not love
Leaving an abusive relationship is simple once you decide to do it, not true — leaving is often the most dangerous period, which is why safety planning with help matters
Arguing means a relationship is failing, not true — conflict is normal in any relationship; what matters is whether it's handled with respect and resolution
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Unit 1: Mental & Emotional Health

Mental Health Continuum
A range from thriving to struggling that a person moves along over time, rather than a fixed 'healthy' or 'ill' label.
Eustress
Positive stress that can motivate performance and feels manageable, such as excitement before a big event.
Distress
Negative stress that overwhelms a person's ability to cope and can harm physical and mental health.
Fight-or-Flight Response
The body's automatic physical reaction to a perceived threat, releasing adrenaline and cortisol to prepare for quick action.
Emotional Intelligence (EQ)
The ability to recognize, understand, and manage your own emotions while recognizing and responding to others' emotions.
Resilience
The ability to adapt to and recover from adversity, setbacks, or stress; a skill that can be strengthened over time.
Depression
A mental health disorder involving persistent sadness or loss of interest lasting two weeks or more, affecting daily functioning.
Generalized Anxiety Disorder
A disorder involving excessive, hard-to-control worry most days for six months or more that interferes with daily life.
Stigma
Negative stereotypes or judgment about a condition (such as mental illness) that discourages people from seeking help.
988 Suicide & Crisis Lifeline
A free, confidential U.S. hotline available 24/7 by call, text, or chat for anyone in emotional distress or suicidal crisis.

Unit 2: Nutrition & Physical Fitness

Macronutrients
Nutrients needed in large amounts for energy and growth: carbohydrates, proteins, and fats.
Micronutrients
Vitamins and minerals needed in small amounts that support functions like immunity and bone health.
MyPlate
The USDA's visual guide for balanced eating, dividing a plate into fruits, vegetables, grains, and protein, plus dairy.
Cardiorespiratory Endurance
The heart and lungs' ability to supply oxygen to the body during sustained physical activity.
FITT Principle
A framework for designing exercise plans based on Frequency, Intensity, Time, and Type.
Muscular Endurance
A muscle's ability to perform repeated contractions over time without becoming fatigued.
Body Composition
The ratio of fat mass to lean mass (muscle, bone, organs) that make up total body weight.
Anorexia Nervosa
An eating disorder involving severe food restriction driven by an intense fear of gaining weight and distorted body image.
Bulimia Nervosa
An eating disorder involving cycles of binge eating followed by purging behaviors like vomiting or excessive exercise.
Binge Eating Disorder
An eating disorder involving recurrent episodes of eating large amounts of food with a felt loss of control, without purging.

Unit 3: Substance Abuse Prevention

Depressant
A drug category that slows central nervous system activity, causing relaxation, slowed breathing, and impaired coordination (e.g., alcohol, opioids).
Stimulant
A drug category that speeds up central nervous system activity, increasing heart rate and alertness (e.g., nicotine, cocaine).
Tolerance
The need for increasing amounts of a substance over time to achieve the same effect.
Physical Dependence
A state in which the body has adapted to a substance and experiences withdrawal symptoms without it.
Blood Alcohol Concentration (BAC)
The percentage of alcohol present in a person's bloodstream, which rises with each drink consumed.
Binge Drinking
Consuming 4+ drinks (females) or 5+ drinks (males) within about a two-hour period, sharply raising alcohol poisoning risk.
Fentanyl
A powerful synthetic opioid increasingly mixed into other drugs, dramatically increasing overdose risk even in tiny amounts.
Naloxone (Narcan)
A medication that can rapidly reverse the effects of an opioid overdose when administered in time.
Refusal Skills
Communication strategies — like clearly saying no and suggesting an alternative — used to resist peer pressure to use substances.
Addiction
A chronic brain disease involving compulsive substance use despite harmful consequences, driven by changes to the brain's dopamine reward system.

Unit 4: Human Development

Puberty
The biological process of sexual and physical maturation triggered by hormones, typically occurring between ages 8-14.
Menstrual Cycle
A roughly 28-day hormonal cycle involving ovulation and, without fertilization, the shedding of the uterine lining.
Ovulation
The release of a mature egg from the ovary, usually near the midpoint of the menstrual cycle.
Fertilization
The joining of a sperm cell and an egg cell, typically occurring in the fallopian tube.
Trimester
One of three roughly 13-week periods used to divide the approximately 40 weeks of pregnancy.
Prenatal Care
Regular medical checkups during pregnancy that monitor the health of both mother and developing baby.
Fetal Alcohol Spectrum Disorder (FASD)
A group of lifelong physical and cognitive conditions caused by alcohol exposure during pregnancy.
Sexually Transmitted Infection (STI)
An infection passed primarily through sexual contact; many, like chlamydia and HPV, often show no symptoms.
Abstinence
Choosing not to have sex; the only method that is 100% effective at preventing both pregnancy and STI transmission.
Contraception
Methods used to prevent pregnancy, ranging from barrier methods to hormonal methods, none 100% effective except abstinence.

Unit 5: Injury Prevention & Safety

RICE method
Rest, Ice, Compression, Elevation — the standard first 24-48 hour treatment for sprains and strains.
Sprain
A stretched or torn ligament, the tissue connecting bone to bone.
Strain
A stretched or torn muscle or tendon, the tissue connecting muscle to bone.
Hands-only CPR
Chest compressions at 100-120 per minute for an unresponsive adult not breathing normally, without rescue breaths.
AED (automated external defibrillator)
A device that analyzes heart rhythm and delivers a shock only if a shockable rhythm is detected; it guides the user through each step.
Heimlich maneuver
Abdominal thrusts used to dislodge an object from the airway of a person who is choking and cannot cough, speak, or breathe.
Heat stroke
A life-threatening emergency involving high body temperature, confusion, and hot, dry skin; requires immediate cooling and 911.
Distracted driving
Any activity (texting, eating, adjusting music) that diverts attention from driving; hands-free use is not fully safe either.
Good Samaritan laws
Laws that generally protect bystanders who give reasonable emergency help in good faith from being sued.
Chain of Survival
The sequence of early recognition/911, early CPR, early defibrillation, and early advanced care that improves cardiac arrest survival.

Unit 6: Disease Prevention

Communicable disease
A disease caused by a pathogen that can spread from person to person, like the flu.
Noncommunicable disease
A disease not spread person-to-person, usually caused by genetics, lifestyle, or environment, like heart disease.
Pathogen
A microorganism (bacteria, virus, fungus, parasite) capable of causing disease.
Antibody
A protein made by white blood cells that recognizes and binds to a specific pathogen, marking it for destruction.
Herd immunity
Protection that occurs when enough of a population is immune, slowing disease spread and protecting those who can't be vaccinated.
Vaccine
A weakened, inactivated, or partial form of a pathogen given to build immune memory without causing the disease.
Atherosclerosis
A buildup of plaque that narrows arteries, a major cause of cardiovascular disease.
Modifiable risk factor
A disease risk factor a person can change, such as diet, physical activity, or tobacco use.
Epidemic vs. pandemic
An epidemic is a disease spreading rapidly in a specific area; a pandemic is a global outbreak.
Universal precautions
Practices like wearing gloves and avoiding contact with blood or bodily fluids to prevent infection when giving first aid.

Unit 7: Consumer & Community Health

Health fraud (quackery)
Selling products or services using false or exaggerated health claims, often targeting people seeking a quick fix.
Premium
The regular amount paid for health insurance, regardless of whether care is used that period.
Deductible
The amount a person must pay out-of-pocket for covered services before insurance starts paying its share.
Copay vs. coinsurance
A copay is a fixed fee for a service; coinsurance is a percentage of the cost shared between patient and insurer.
Primary care provider
A healthcare provider who manages overall health, routine checkups, and referrals to specialists.
CDC
The Centers for Disease Control and Prevention — tracks disease outbreaks and issues public health guidance in the U.S.
FDA
The Food and Drug Administration — regulates the safety of food, drugs, vaccines, and medical devices.
Food desert
An area with limited access to affordable, healthy food, linked to poorer diet quality and higher chronic disease rates.
Environmental justice
The recognition that pollution and health hazards are often unevenly distributed, disproportionately affecting lower-income communities.
Health advocacy
Taking action to support health at a personal, community, or policy level, such as supporting a public health law.

Unit 8: Healthy Relationships

Healthy relationship
A relationship built on mutual respect, trust, honesty, equality, and support for each person's individuality.
'I' statement
A way of expressing a concern (e.g., 'I feel frustrated when...') that avoids blame and reduces defensiveness.
Consent (F.R.I.E.S.)
Agreement that must be Freely given, Reversible, Informed, Enthusiastic, and Specific.
Boundary
A physical, emotional, or digital limit a person sets for what they are and are not comfortable with.
Cycle of abuse
A pattern of tension-building, an abusive incident, and a 'honeymoon' reconciliation phase that repeats.
Digital abuse
Controlling behavior through technology, such as demanding passwords or constantly monitoring someone's messages.
Assertive communication
Expressing your own needs and opinions clearly and respectfully, without being passive or aggressive.
Refusal skills
Techniques like saying no clearly, offering an alternative, and being willing to leave a situation to resist pressure.
Peer pressure
Influence from peers to think or act a certain way; can be direct or indirect, positive or negative.
National Domestic Violence Hotline
A confidential resource available to anyone in, or worried about, an abusive relationship.
Press 1–4 to answer · Enter for next

Unit 1: Mental & Emotional Health

The Mental Health Continuum
Mental health is not a fixed label of 'healthy' or 'ill' — it exists on a continuum from thriving to struggling, and everyone moves along it over time depending on life circumstances, coping skills, and support.
Stress and the Body's Stress Response
Stress is the body's physical and emotional reaction to a demand or challenge. The 'fight-or-flight' response releases adrenaline and cortisol to prepare the body to react quickly, which is helpful short-term but harmful if triggered constantly.
Emotions and Emotional Intelligence
Emotional intelligence (EQ) is the ability to recognize, understand, and manage your own emotions while also recognizing and responding well to the emotions of others.
Healthy Coping Strategies and Resilience
Coping strategies are the specific actions people use to manage stress and difficult emotions. Resilience is the ability to adapt and bounce back after setbacks, and it can be built like a skill.
Anxiety and Depressive Disorders
Anxiety disorders and depression are the most common mental health conditions among teens. They are medical conditions involving changes in brain chemistry and function, not a choice or character flaw.
Warning Signs and Seeking Help
Knowing the warning signs of a mental health crisis and how to respond can save a life. Suicide is preventable, and most people who consider it give some warning signs beforehand.
Key fact
About 1 in 5 teens experiences a diagnosable mental health disorder in a given year, most commonly anxiety or depression
Key fact
Chronic (long-term) stress raises cortisol levels and is linked to high blood pressure, weakened immunity, and disrupted sleep
Key fact
Depression is diagnosed when symptoms last two weeks or more and interfere with daily functioning, not just a bad day
Key fact
988 (call, text, or chat) is the free, confidential U.S. Suicide & Crisis Lifeline available 24 hours a day

Unit 2: Nutrition & Physical Fitness

Macronutrients and Their Roles
Macronutrients are the nutrients the body needs in large amounts for energy and growth: carbohydrates, proteins, and fats. Each has a distinct job in the body.
Micronutrients: Vitamins and Minerals
Micronutrients are vitamins and minerals needed in small amounts that support essential body functions like immunity, bone health, and energy metabolism.
MyPlate and Balanced Eating
MyPlate is the USDA's visual guide for building balanced meals, replacing the older food pyramid, and emphasizing portion balance across food groups.
Components of Physical Fitness
Physical fitness has five key components, and a well-rounded fitness plan addresses all of them rather than just one.
Benefits of Regular Physical Activity
Regular physical activity benefits nearly every body system and is one of the most powerful tools for long-term health, both physical and mental.
Body Image, Eating Disorders, and Healthy Weight Management
A healthy relationship with food and body image is essential; when it breaks down, it can lead to disordered eating patterns that require professional treatment.
Key fact
MyPlate recommends filling half the plate with fruits and vegetables at most meals
Key fact
Carbohydrates and protein each provide about 4 calories per gram; fat provides about 9 calories per gram
Key fact
The CDC recommends at least 60 minutes of moderate-to-vigorous physical activity daily for teens
Key fact
The five components of fitness are cardiorespiratory endurance, muscular strength, muscular endurance, flexibility, and body composition

Unit 3: Substance Abuse Prevention

Categories of Drugs and How They Affect the Body
Drugs are classified by how they affect the central nervous system: depressants, stimulants, and hallucinogens each produce different effects on mood, perception, and body function.
Alcohol: Effects and Risks
Alcohol is a depressant that impairs judgment, coordination, and reaction time, and its effects are especially harmful to the developing adolescent brain.
Nicotine, Vaping, and Tobacco
Nicotine is a highly addictive stimulant found in cigarettes, e-cigarettes/vapes, and other tobacco products, and it is especially harmful to the developing adolescent brain.
Marijuana and Other Illicit Drugs
Marijuana (cannabis) and other illicit drugs carry health and legal risks, and their effects vary widely by substance, dose, and the user's age.
Why People Use Substances and Risk/Protective Factors
Understanding why people begin using substances helps identify effective prevention strategies, since risk rarely comes from a single cause.
Addiction as a Disease and Paths to Recovery
Addiction is recognized by medical science as a chronic disease of the brain's reward system, not a moral failing, and recovery is possible with proper treatment and support.
Key fact
Nicotine reaches the brain within seconds and is highly addictive, especially for the developing teen brain
Key fact
Binge drinking is defined as 4+ drinks for females or 5+ for males within about two hours
Key fact
Fentanyl is a powerful synthetic opioid increasingly mixed into other drugs, greatly increasing overdose risk
Key fact
Addiction is classified as a chronic brain disease affecting the dopamine reward system, not a moral failing

Unit 4: Human Development

Puberty and Adolescent Development
Puberty is the biological process during which the body matures sexually and physically, triggered by hormones, and it brings physical, emotional, and social changes.
The Reproductive Systems
The male and female reproductive systems each have specific organs and functions related to producing offspring, and understanding them is essential for making informed health decisions.
Pregnancy and Prenatal Development
Pregnancy involves the development of a fertilized egg into a fetus over approximately 40 weeks, divided into three trimesters, each with distinct developmental milestones.
Sexually Transmitted Infections and Prevention
Sexually transmitted infections (STIs) are infections passed primarily through sexual contact, and understanding transmission and prevention is a core part of reproductive health education.
Contraception and Responsible Decision-Making
Contraception refers to methods used to prevent pregnancy, and understanding the range of options — along with their effectiveness — supports informed, responsible decision-making.
Family Life, Parenting Readiness, and Life Stages
Human development continues across the lifespan, and understanding the stages of life — along with the responsibilities of parenting — helps build realistic expectations for the future.
Key fact
Puberty is triggered by hormones — estrogen/progesterone in females and testosterone in males — and timing varies normally between individuals
Key fact
Pregnancy lasts about 40 weeks, divided into three trimesters, each with distinct developmental milestones
Key fact
Abstinence is the only method that is 100% effective at preventing both pregnancy and STI transmission
Key fact
Many STIs, including chlamydia and HPV, often show no symptoms, making regular testing essential for sexually active people

Unit 5: Injury Prevention & Safety

Treating Common Injuries: RICE and Beyond
Most sports and activity injuries — sprains, strains, and minor fractures — respond well to prompt, correct first aid, and knowing the difference between injury types determines the right response.
CPR, AEDs, and Responding to Choking
Cardiac arrest and choking are life-threatening emergencies where bystander action in the first few minutes dramatically affects survival, and basic steps can be learned by anyone.
Motor Vehicle and Pedestrian Safety
Motor vehicle crashes are the leading cause of death for U.S. teenagers, and most of the risk factors involved are preventable through specific behavior changes.
Water, Weather, and Recreational Safety
Environmental hazards like water, extreme heat, extreme cold, and severe weather cause preventable injuries and deaths every year, especially during outdoor recreation.
Violence Prevention and Personal Safety
Preventing violence — from bullying to weapons-related incidents — relies on recognizing warning signs early, defusing conflict, and knowing when and how to get help.
Emergency Preparedness and the EMS System
Knowing how to activate the emergency medical system (EMS) and prepare for likely local disasters turns a bystander into an effective first responder.
Key fact
Motor vehicle crashes are a leading cause of death among U.S. teenagers, and seatbelt use cuts fatal injury risk roughly in half
Key fact
Hands-only CPR uses chest compressions at a rate of 100-120 per minute for an unresponsive adult who isn't breathing normally
Key fact
RICE (Rest, Ice, Compression, Elevation) is the standard first 24-48 hour treatment for sprains and strains
Key fact
Heat stroke — confusion with hot, dry skin and no sweating — is a life-threatening emergency requiring immediate cooling and 911

Unit 6: Disease Prevention

Communicable vs. Noncommunicable Disease
Diseases fall into two broad categories based on whether they can spread from person to person, and the prevention strategy for each is very different.
How Pathogens Spread and the Immune System's Defense
Understanding how pathogens travel from person to person, and how the immune system fights them off, explains why hygiene practices and vaccines work.
Vaccines and Herd Immunity
Vaccines train the immune system to recognize a pathogen without causing the disease itself, and when enough of a population is vaccinated, it protects even those who cannot be.
Cardiovascular Disease and Cancer Risk Factors
Cardiovascular disease and cancer are leading noncommunicable causes of death, and many of their risk factors are modifiable through lifestyle choices.
Chronic Disease Prevention Through Lifestyle
Many of the most common chronic diseases share the same small set of preventable lifestyle risk factors, which means the same healthy habits protect against multiple diseases at once.
Hygiene Practices That Prevent Illness
Simple, consistent hygiene habits break the chain of infection at the point of transmission and are among the most effective, low-cost tools for preventing communicable disease.
Key fact
Communicable diseases are caused by pathogens and spread between people; noncommunicable diseases are not spread person-to-person
Key fact
Vaccines build immune memory using a weakened, inactivated, or partial pathogen so the body can respond quickly to a real future infection
Key fact
Herd immunity protects people who cannot be vaccinated when enough of the surrounding population is immune
Key fact
Handwashing with soap for at least 20 seconds is one of the single most effective ways to prevent the spread of illness

Unit 7: Consumer & Community Health

Being a Critical Health Consumer
Health consumers are constantly targeted by advertising and health claims, and evaluating those claims critically protects both wallets and well-being.
Understanding Health Insurance and Healthcare Costs
Health insurance is a system for sharing the financial risk of medical costs, and understanding its basic vocabulary helps people make informed healthcare decisions.
Choosing Healthcare Providers and Services
Different healthcare needs call for different types of providers and settings, and knowing which to use saves time, money, and gets more appropriate care.
Public Health Agencies and Their Roles
A network of government agencies at the local, national, and global level works to protect community health through research, regulation, and response.
Environmental Health and Community Resources
The environment where people live, work, and go to school directly shapes health outcomes, and communities can act collectively to reduce environmental health risks.
Health Advocacy and Community Health Promotion
Health advocacy means taking action to support health at a personal, community, or policy level, and it's a skill anyone can build regardless of age.
Key fact
A premium is what you pay for insurance regardless of use; a deductible is what you pay out-of-pocket before insurance coverage kicks in
Key fact
The CDC tracks disease and issues guidance nationally, the FDA regulates food/drug/device safety, and the WHO coordinates global public health
Key fact
Dietary supplements are regulated far less strictly by the FDA than prescription or over-the-counter medications
Key fact
Urgent care is for prompt, non-life-threatening issues; the emergency room is reserved for life-threatening conditions

Unit 8: Healthy Relationships

Characteristics of Healthy vs. Unhealthy Relationships
All relationships — friendships, family, and romantic — fall somewhere on a spectrum from healthy to unhealthy to abusive, and recognizing the pattern matters more than any single incident.
Communication Skills and Conflict Resolution
Conflict is a normal part of any relationship; what determines whether a relationship stays healthy is how the people involved communicate through it.
Setting Boundaries and Understanding Consent
Boundaries are the limits a person sets for what they are and are not comfortable with, and consent is the clear, ongoing agreement required before any shared activity, especially physical intimacy.
Recognizing and Responding to Abuse
Abuse in a relationship can be physical, emotional, sexual, or digital, and recognizing early warning signs — in your own relationship or a friend's — is critical to getting help before harm escalates.
Peer Pressure and Assertiveness
Peers strongly influence adolescent decision-making, and assertive communication is the key skill that allows someone to stay true to their values under social pressure.
Family Relationships and Support Systems
Family relationships, whatever form they take, are often a person's first and most enduring support system, and the same principles of healthy communication apply within them.
Key fact
Consent must be freely given, reversible, informed, enthusiastic, and specific — often remembered with the acronym F.R.I.E.S.
Key fact
The cycle of abuse typically includes tension-building, an incident, and a 'honeymoon' reconciliation phase, which can make leaving feel confusing
Key fact
Assertive communication expresses your needs clearly and respectfully, distinct from passive (avoiding conflict) or aggressive (disrespecting others) styles
Key fact
'I' statements reduce defensiveness in conflict by expressing a feeling without directly blaming the other person
Common mistakes for each unit — read the mistake, then make sure you know why it's wrong.

Unit 1: Mental & Emotional Health

Watch out
All stress is harmful, not true — eustress (like excitement before a big game) is short-term stress that can improve focus and performance
Watch out
Mental illness is a sign of personal weakness, not true — it is a medical condition involving brain chemistry, genetics, and environment, just like a physical illness
Watch out
Asking someone directly if they're suicidal will give them the idea, not true — direct, caring questions open the door to help and do not increase risk
Watch out
Keeping a friend's suicidal thoughts secret is loyalty, not true — telling a trusted adult immediately is the responsible, life-saving action

Unit 2: Nutrition & Physical Fitness

Watch out
'Fat-free' means healthy, not true — fat-free foods often add sugar to make up for lost flavor, so the label alone doesn't guarantee it's healthier
Watch out
Skipping meals is an effective way to lose weight, not true — it often leads to overeating later and can slow metabolism
Watch out
Eating disorders are a lifestyle choice about vanity, not true — they are serious mental illnesses with biological, psychological, and social roots
Watch out
All fats are bad for you, not true — unsaturated fats (nuts, olive oil, fish) support heart health, while saturated/trans fats in excess raise risk

Unit 3: Substance Abuse Prevention

Watch out
Vaping is a harmless alternative to smoking, not true — vapes deliver addictive nicotine plus heated chemicals and are not proven safe
Watch out
Marijuana is completely harmless because it's 'natural,' not true — THC impairs memory, coordination, and judgment, especially in the developing teen brain
Watch out
Addiction is just a lack of willpower, not true — it is a chronic brain disease that changes the dopamine reward pathway and requires treatment
Watch out
Prescription drugs are always safe because a doctor prescribes them, not true — taking them differently than prescribed or using someone else's prescription carries real risks

Unit 4: Human Development

Watch out
You can tell if someone has an STI just by looking at them, not true — many STIs show no visible symptoms at all
Watch out
Birth control pills protect against STIs, not true — hormonal methods prevent pregnancy but provide no protection against sexually transmitted infections
Watch out
Puberty happens at the exact same age and pace for everyone, not true — timing and pace vary widely and normally between individuals
Watch out
A condom is 100% effective at preventing pregnancy and STIs, not true — used correctly it greatly reduces risk, but only abstinence is 100% effective

Unit 5: Injury Prevention & Safety

Watch out
Hands-free texting or calls while driving are just as safe as not using a phone, not true — both divert attention and slow reaction time similarly to handheld use
Watch out
You should always try to straighten or realign a suspected broken bone, not true — the area should be immobilized as found, not straightened
Watch out
Applying ice directly to bare skin speeds healing, not true — direct ice contact for extended periods can cause frostbite; always use a cloth barrier
Watch out
Drowning always looks dramatic, with lots of splashing and yelling, not true — it is often silent and quick, which is why constant supervision near water is essential

Unit 6: Disease Prevention

Watch out
Vaccines can give you the disease they protect against, not true — mild side effects like soreness or low fever are signs of an immune response, not illness
Watch out
If you have no family history of a disease, lifestyle habits don't matter, not true — modifiable risk factors like diet, activity, and smoking affect risk regardless of genetics
Watch out
Antibiotics work against viruses like the cold or flu, not true — antibiotics only treat bacterial infections, not viral ones
Watch out
You can't spread an illness if you feel fine, not true — many pathogens are contagious during an incubation period before symptoms appear

Unit 7: Consumer & Community Health

Watch out
'Natural' or 'FDA-approved' on a supplement label guarantees it's safe and effective, not true — supplements face much lighter regulation than medications
Watch out
Going to the ER for any medical concern is always the right call, not true — non-emergencies are better and more affordably handled at urgent care or a primary provider
Watch out
A higher premium always means better coverage, not true — plans vary widely in deductibles, copays, and networks, so total cost depends on the whole plan
Watch out
Public health agencies only matter during a crisis, not true — they do ongoing work like restaurant inspections, immunization programs, and water quality monitoring year-round

Unit 8: Healthy Relationships

Watch out
If someone doesn't say 'no,' that means they've consented, not true — consent requires clear, active, enthusiastic agreement, not just the absence of refusal
Watch out
Jealousy is proof that a partner really cares, not true — extreme jealousy and controlling behavior are warning signs of an unhealthy or abusive dynamic, not love
Watch out
Leaving an abusive relationship is simple once you decide to do it, not true — leaving is often the most dangerous period, which is why safety planning with help matters
Watch out
Arguing means a relationship is failing, not true — conflict is normal in any relationship; what matters is whether it's handled with respect and resolution