Stress doesn't care about your exam schedule.
It shows up anyway — tight chest, racing thoughts, that weird buzzing feeling under your skin when you've had three hours of sleep and a DBQ due at midnight. The mind-body connection. And if you're taking AP Psychology, you're about to study the very thing that's wrecking you. Which means unit 5 (or Unit 8, depending on your teacher's pacing) covers mental and physical health. Stress, coping, illness, and why your brain can literally make your body sick Not complicated — just consistent..
It's one of the most practical units in the entire course. Also one of the most tested.
Here's the breakdown — no fluff, just what you actually need to know.
What This Unit Actually Covers
The College Board calls it "Clinical Psychology" in the new framework. That's why your textbook might call it "Health Psychology" or "Stress and Health. " Same core ideas.
You're looking at how psychological factors influence physical health — and vice versa. The big pillars:
- Stress: what it is, how it works, what it does to you
- Coping: the strategies people use (some work, most don't)
- Health behaviors: why we smoke, skip exercise, ignore symptoms
- The immune system: how stress rewires your biology
- Psychological disorders: brief intro, but the heavy lifting happens later
If your class follows the older curriculum, Unit 5 might be States of Consciousness. But "mental and physical health" screams health psychology. I'm writing for that version — the one where you learn why your roommate gets mono every finals week Most people skip this — try not to. Still holds up..
The Stress Response: Your Body's Ancient Alarm System
Hans Selye. Remember the name. He gave us the General Adaptation Syndrome (GAS) — three stages your body moves through when a stressor hits Most people skip this — try not to..
Alarm
Fight or flight. Sympathetic nervous system dumps adrenaline and cortisol. Heart pounds. Digestion shuts down. Pupils dilate. You're ready to run from a lion — or sprint to the testing center.
Resistance
The stressor persists. Your body stays activated. Cortisol keeps glucose high. You function, barely. This is the "I'm fine" phase. You're not fine And it works..
Exhaustion
Resources depleted. Immune system crashes. Organs take damage. This is where illness lives. Ulcers. Hypertension. Depression. The body says "enough" and breaks.
Selye's model is elegant. It's also incomplete. It treats stress as purely physiological. But Richard Lazarus argued stress is transactional — it depends on appraisal Nothing fancy..
Primary Appraisal
Is this event irrelevant, benign-positive, or stressful? If stressful: harm/loss, threat, or challenge?
Secondary Appraisal
Do I have the resources to handle it? Money, time, skills, support, Xanax?
Two people face the same exam. Different cortisol curves. One sees a challenge. The other sees a threat. Different outcomes Worth keeping that in mind..
This is the single most testable concept in the unit. Know the difference between GAS and transactional model. Know which one includes cognition Took long enough..
What Stress Actually Does to Your Body
It's not just "feeling stressed." Stress rewires your biology Small thing, real impact..
The HPA Axis
Hypothalamus → Pituitary → Adrenal cortex. Cortisol floods your bloodstream. Short term: anti-inflammatory, energy mobilization. Chronic: hippocampal shrinkage, impaired memory, suppressed immunity It's one of those things that adds up. That's the whole idea..
The SAM Pathway
Sympathetic-adrenal-medullary axis. Faster. Adrenaline. Noradrenaline. Heart rate, blood pressure, sweat. This is the "oh sh*t" response Not complicated — just consistent. Simple as that..
Immune Suppression
Cortisol inhibits lymphocyte production. Natural killer cells drop. Wound healing slows. Vaccine response weakens. Cohen's classic study: people with high stress scores were significantly more likely to develop cold symptoms after viral exposure. Dose-response relationship. More stress = more sickness.
Cardiovascular Damage
Chronic stress → endothelial dysfunction → atherosclerosis → heart attack. Type A behavior pattern (Friedman & Rosenman) — specifically hostility — predicts coronary heart disease better than cholesterol.
Telomeres
This is newer research. Chronic stress shortens telomeres — the protective caps on chromosomes. Cellular aging accelerated. Epel et al. (2004): mothers of chronically ill children had telomeres 10 years "older" than controls.
Coping: What Works, What Doesn't, and Why You're Probably Doing It Wrong
Lazarus and Folkman again. Two main categories:
Problem-Focused Coping
Tackle the stressor directly. Study. Ask for extension. Break task into chunks. Works best when the situation is controllable.
Emotion-Focused Coping
Regulate the emotional response. Meditation. Venting. Denial. Distraction. Works best when the situation is uncontrollable — grief, terminal diagnosis, global pandemic And that's really what it comes down to..
Most students default to emotion-focused for controllable problems (procrastination = avoidance) and problem-focused for uncontrollable ones (trying to "fix" a parent's divorce). Backwards.
The Trap of Avoidance
Avoidance coping — substance use, behavioral disengagement, denial — correlates with worse outcomes across the board. But it feels good now. That's the hook.
Social Support
Buffering hypothesis: support protects health during high stress. Direct effect hypothesis: support helps always. Perceived support matters more than received support. Thinking "I have people" beats "three people texted me."
Hardiness (Kobasa)
Three Cs: Commitment, Control, Challenge. People high in hardiness get sick less. It's basically stress mindset + resilience.
Post-Traumatic Growth
Not just bouncing back. Bouncing forward. New priorities, deeper relationships, greater appreciation. Tedeschi & Calhoun. Not everyone gets it. But it's real Turns out it matters..
Health Behaviors: Why We Know Better and Do It Anyway
Knowing broccoli beats Cheetos doesn't make you eat broccoli. This unit explains why.
The Health Belief Model
Four perceptions predict behavior:
- Perceived susceptibility — "I could get skin cancer"
- Perceived severity — "Skin cancer would be bad"
- Perceived benefits — "Sunscreen prevents it"
- Perceived barriers — "Sunscreen is greasy / I forget / I look pale"
Cues to action (mole looks weird, doctor nags) + self-efficacy = behavior change.
Theory of Planned Behavior
Attitude + subjective norms + perceived
