Stress

Stress is the body's response to any event or condition that requires adaptation. It arises through a specific cognitive process, comes from a wide range of sources, triggers a well-defined physiological cascade, and — left unmanaged — carries real emotional, behavioral, and physical consequences.

Key Takeaways

• Cognitive appraisal (Richard Lazarus) happens in stages: primary appraisal classifies a situation as irrelevant, benign-positive, or stressful; secondary appraisal evaluates harm, threat, and challenge; reappraisal applies to ongoing situations.

• Stressors fall into environmental, daily-event, workplace/academic, social-expectation, and chemical/biological categories, and produce either distress (unpleasant stressors) or eustress (positive stressors that still require adaptation).

• The Social Readjustment Scale (Thomas Holmes and Richard Rahe) measures stress in life change units.

• Four psychological stressors — pressure, control, predictability, and frustration/conflict — shape stress levels, with conflict further divided into approach-approach, avoidance-avoidance, and approach-avoidance subtypes.

• The body's immediate stress response comes from the sympathetic nervous system ("fight or flight"); the longer-term response follows Hans Selye's General Adaptation Syndrome: alarm (hypothalamus → CRH → pituitary → ACTH → adrenal cortex → cortisol, plus adrenal medulla epinephrine/norepinephrine), resistance (sustained hormone release), and exhaustion (depleted response, increased illness susceptibility).

• Elevated stress produces emotional effects (irritability, moodiness, fear, helplessness, impaired concentration/memory) and behavioral effects (social withdrawal, substance use, aggression), and chronic stress can contribute to anxiety and depression.

• Coping strategies (Richard Lazarus and Susan Folkman) fall into problem-focused (directly addressing the stressor) and emotion-focused (changing one's feelings about the stressor) categories, alongside stress management techniques like exercise and relaxation techniques.

Cognitive Appraisal of Stress

Cognitive appraisal, a framework developed by psychologist Richard Lazarus, describes the subjective evaluation a person makes of a situation that induces stress. Appraisal happens in two sequential stages, followed by ongoing reappraisal as needed.

Primary Appraisal

Primary appraisal is the initial evaluation of the environment and any associated threat. In this stage, a situation is identified as one of three things: irrelevant, benign-positive, or stressful.

Secondary Appraisal

If primary appraisal results in an evaluation of threat, secondary appraisal begins. This stage is directed at evaluating whether the individual can cope with the stress, and it involves weighing three things:

• Harm: the damage already caused by the event.

• Threat: the potential for future damage caused by the event.

• Challenge: the potential to overcome — and possibly benefit from — the event.

Individuals who perceive themselves as having the ability to overcome an event experience less stress than those who don't. Appraisal and stress are therefore personal: individuals differ in their skills, abilities, and coping mechanisms, so the same event can be appraised very differently by two different people.

Reappraisal

Reappraisal applies to situations that require ongoing monitoring rather than a single evaluation — for example, the perception of being followed by someone, which a person continues to reassess as the situation unfolds.

Types of Stressors

A stressor is a biological element, external condition, or event that leads to a stress response.

Common Stressor Categories

Common stressors fall into several categories:

• Environmental factors: uncomfortable temperature, loud sounds, inclement weather.

• Daily events: running late, losing items, unexpected occurrences.

• Workplace or academic setting: assignments, hierarchical interactions, time management.

• Social expectations: demands placed on oneself by society, family, and friends.

• Chemical and biological factors: diet, alcohol, viruses, allergies, medications, medical conditions.

Distress and Eustress

Stressors produce either distress or eustress. Distress occurs in response to unpleasant stressors, while eustress results from positive conditions, such as graduating college. Even though eustress-producing events are positive, any event that requires a person to change or adapt their lifestyle still leads to a stress response.

The Social Readjustment Scale, developed by Thomas Holmes and Richard Rahe, is a method used to measure stress levels. It's measured in "life change units" — a standardized weighting of how much readjustment a given life event, positive or negative, tends to require.

MCAT Callout — Eustress is still stress: don't assume a positive life event (marriage, a promotion, graduating) produces no stress response just because it feels good. The Social Readjustment Scale assigns life change units to positive and negative events alike, since both require adaptation.

Psychological Stressors

Beyond these broad categories, four specific psychological stressors are worth knowing individually: pressure, control, predictability, and frustration/conflict.

• Pressure: occurs when demands are placed on a person from external sources, producing a feeling of urgency to complete tasks, perform actions, or display particular behaviors.

• Control: the ability to control one's surroundings typically reduces stress levels, while a lack of control increases it — which is part of why pressure functions as a stressor in the first place.

• Predictability: a lack of routine increases stress. Firefighters and police officers, for example, experience higher stress levels than workers with predictable routines, since their work lacks that routine element.

• Frustration: occurs when attaining a goal or a need is prevented.

• Conflict: arises from the need to make a choice. Conflict comes in three forms:

• Approach-approach: choosing between two desirable options.

• Avoidance-avoidance: choosing between two undesirable options.

• Approach-avoidance: only one choice, goal, or event is available, but it carries both positive and negative elements — for example, accepting a promotion that comes with more money but also more responsibility.

MCAT Callout — Telling the conflict types apart: approach-approach means both options are things you want; avoidance-avoidance means both options are things you want to avoid; approach-avoidance means there's only one option on the table, and it has both an upside and a downside built in. A vignette describing someone torn between two job offers is approach-approach. One describing someone stuck choosing between two unpleasant chores is avoidance-avoidance. One describing hesitation over a single opportunity with mixed pros and cons is approach-avoidance.

The Physiological Response to Stressors

The body's first response to a stressor comes through the sympathetic nervous system. This "fight or flight" response initiates an increased heart rate and a decrease in digestive activity, preparing the body to respond to the stressor immediately.

The General Adaptation Syndrome

Beyond this immediate reaction, the body follows a longer sequence of responses known as the General Adaptation Syndrome, first described by physiologist Hans Selye. The syndrome consists of three stages.

Alarm is the initial reaction to a stressor and the activation of the sympathetic nervous system. The hypothalamus releases corticotropin-releasing hormone (CRH), which stimulates the pituitary gland to secrete ACTH (adrenocorticotropic hormone); ACTH in turn stimulates the adrenal glands to produce cortisol. Cortisol maintains a steady supply of blood sugar needed to respond to stressful events. At the same time, the hypothalamus also activates the adrenal glands to release epinephrine and norepinephrine, which activate the sympathetic nervous system.

Resistance follows: the continuous release of these hormones allows the sympathetic nervous system to remain engaged in order to keep fighting the stressor.

Exhaustion is the final stage, in which the body can no longer maintain an elevated response. At this point, the individual becomes more susceptible to illness and medical conditions, and organ systems can begin to deteriorate.

MCAT Callout — Two adrenal pathways, one alarm stage: the alarm stage activates the adrenal glands through two separate pathways at once — the adrenal cortex (via the hypothalamus-CRH-pituitary-ACTH cascade, producing cortisol) and the adrenal medulla (via direct hypothalamic activation, producing epinephrine and norepinephrine). A passage describing elevated cortisol and a passage describing elevated epinephrine are both describing the same alarm stage, not two different stages.

Emotional and Behavioral Responses to Stress

Stress takes a toll on both the physical body and the psyche. Elevated stress levels can produce irritable, moody, tense, fearful, and helpless moods, and can interfere with concentration and memory. Chronic stress can lead to mental health disorders such as anxiety and depression, and it can affect behavior as well — potentially leading to social withdrawal, substance use, aggression, and, in severe cases, suicide.

Coping and Stress Management

Coping with stress falls into two broad strategy categories, drawn from the transactional model of stress and coping developed by Richard Lazarus and Susan Folkman.

Problem-focused strategies work to overcome a stressor directly — for example, reaching out to friends or family, confronting the issue head-on, or creating a concrete plan to address it. Emotion-focused strategies instead focus on changing one's feelings about a stressor. These include taking responsibility for the issue, engaging in hopeful thinking, and using positive reappraisal to focus on potential positive outcomes rather than the stressor itself. Problem-focused strategies tend to predominate when a stressor feels controllable, while emotion-focused strategies tend to predominate when a stressor feels uncontrollable.

Beyond these two categories, specific stress management techniques can reduce stress levels directly. Exercise helps by releasing endorphins, which are opioid neuropeptides. Relaxation techniques — including meditation, deep breathing, and progressive muscle relaxation — also help manage stress, as can spiritual practice.

Why Stress Matters for the MCAT

Stress questions tend to test whether a reader can map a described scenario to the correct appraisal stage, stressor type, physiological stage, or coping strategy:

• Appraisal sequencing. Primary appraisal (is this a threat?) always precedes secondary appraisal (can I cope with it?) — a passage testing whether a person judges a situation as harmful, threatening, or challenging is testing secondary appraisal, not primary.

• Conflict-type matching. Approach-approach, avoidance-avoidance, and approach-avoidance are frequently tested through vignettes describing a decision — identify how many options are on the table and whether they're desirable, undesirable, or mixed.

• The General Adaptation Syndrome. Know both the three stages (alarm, resistance, exhaustion) and the specific hormonal cascade of the alarm stage (hypothalamus, CRH, pituitary, ACTH, adrenal cortex, cortisol, plus adrenal medulla epinephrine/norepinephrine) — a common source of passage-based questions involving hormone measurements or chronic stress outcomes.

• Coping strategy identification. Problem-focused and emotion-focused coping are frequently tested by describing a person's specific response to a stressor and asking which category it falls into.

Common MCAT Mistakes

• Assuming primary and secondary appraisal are interchangeable — primary appraisal only classifies a situation as irrelevant, benign-positive, or stressful; secondary appraisal is the separate step of weighing harm, threat, and challenge, and only happens once primary appraisal has flagged a threat.

• Treating eustress as stress-free just because it stems from a positive event — any event requiring adaptation, positive or negative, still registers as a stressor and earns life change units on the Social Readjustment Scale.

• Confusing the three conflict subtypes — approach-approach and avoidance-avoidance both involve two options (desirable or undesirable, respectively), while approach-avoidance involves only one option that carries both.

• Treating cortisol release and epinephrine/norepinephrine release as separate stages of the General Adaptation Syndrome — both originate in the same alarm stage, just via two different adrenal pathways (cortex vs. medulla).

MCAT-Style Concept Check

Question: A medical resident describes feeling torn between two job offers: one at a prestigious hospital with a grueling schedule, and one at a smaller clinic with better hours but less prestige. Both options are appealing to her, but she can only choose one. Which type of conflict does this scenario best illustrate?

• A) Approach-approach conflict

• B) Avoidance-avoidance conflict

• C) Approach-avoidance conflict

• D) Primary appraisal

Answer: A

Explanation: Both job offers are desirable to the resident — she wants the prestige of one and the better hours of the other — and she must choose between two things she wants. That's the defining feature of approach-approach conflict. Avoidance-avoidance would require both options to be undesirable, and approach-avoidance would require a single option carrying both positive and negative features rather than two separate options. Primary appraisal is a stage of cognitive appraisal, not a type of conflict.

FAQ

What's the difference between primary and secondary appraisal?

Primary appraisal is the initial evaluation of whether a situation is irrelevant, benign-positive, or stressful. If primary appraisal identifies a threat, secondary appraisal follows, evaluating the harm already caused, the threat of future damage, and the challenge — or potential benefit — of the situation.

Is eustress bad for you?

Not inherently — eustress comes from positive events, like a promotion or graduation. But because it still requires a person to adapt to change, it still triggers a stress response and still counts as a "life change unit" on the Social Readjustment Scale, alongside negative events.

What are the three stages of the General Adaptation Syndrome?

Alarm, resistance, and exhaustion. Alarm activates the sympathetic nervous system and triggers the hypothalamus-CRH-pituitary-ACTH-cortisol cascade alongside adrenal release of epinephrine and norepinephrine. Resistance sustains that hormone release to keep fighting the stressor. Exhaustion sets in when the body can no longer maintain the elevated response, increasing susceptibility to illness.

What's the difference between problem-focused and emotion-focused coping?

Problem-focused coping addresses the stressor directly — reaching out for help, confronting the issue, or making a plan. Emotion-focused coping instead changes how a person feels about the stressor, through strategies like positive reappraisal or hopeful thinking. Problem-focused coping tends to dominate when a stressor feels controllable; emotion-focused coping tends to dominate when it doesn't.