Psychological factors in physical illness
- Concept
Mind and body interact: stress, mood and behavior can bring on or worsen physical illness, and illness affects mood in return.
What it is
Psychological factors can affect physical illness through three routes: biological (stress hormones, autonomic and immune changes), behavioral (smoking, diet, sleep, adherence) and through how symptoms are noticed and reported. The link runs both ways: chronic illness raises the risk of depression and anxiety. The old idea that specific personalities cause specific diseases has been largely abandoned.
Key facts
- DSM-5 lists ‘psychological factors affecting other medical conditions’ for a diagnosed medical illness worsened by psychological or behavioral factors.
- Type A behavior (competitive, impatient, hostile) was an early heart-disease hypothesis; later studies did not confirm it as a whole.
- Caregivers of relatives with dementia show measurable immune changes, a classic example of chronic stress.
- Psychological treatment can improve symptoms in IBS, chronic pain and tension headache.
Examples of the mind–body link
| Condition | Psychological factor | Likely route |
|---|---|---|
| Coronary disease | Depression, hostility, social isolation | Sympathetic activation, inflammation, worse adherence |
| Takotsubo cardiomyopathy | Sudden emotional or physical stress | Likely a catecholamine surge that stuns the myocardium |
| Irritable bowel syndrome | Anxiety, stress, past adversity | Gut–brain axis and visceral hypersensitivity |
| Fibromyalgia | Stress, poor sleep, catastrophizing | Central sensitization to pain |
| Tension-type headache | Stress, poor sleep | Muscle tension and lower pain threshold |
Clinical notes
- Screening for depression in patients with heart disease is recommended because depression worsens prognosis.
- Explaining a stress link without implying ‘it is all in your head’ protects the relationship and adherence.
Test yourself
Think of the answer, then tap the question to see it.
Which component of the type A pattern is most strongly linked to coronary disease?
Hostility and anger.
What are three routes by which psychological factors affect physical illness?
Biological (hormones, autonomic and immune changes), behavioral (habits, adherence) and perception and reporting of symptoms.
Which cardiomyopathy is classically triggered by acute emotional stress?
Takotsubo (stress) cardiomyopathy.
Why does depression matter after a myocardial infarction?
It is common and is associated with higher cardiac mortality and worse adherence.
Elsewhere in DurgiPedia
Connections
Educational content on behavior and the clinical relationship; not a diagnostic or treatment guide and no substitute for assessment by a health professional. If you or someone near you is at risk, seek help now from an emergency service or a mental-health helpline.
Sources: Psychological Stress and the Human Immune System: A Meta-Analytic Study of 30 Years of Inquiry (Psychological Bulletin, via PubMed Central (US National Library of Medicine), 2004); Psychological factors and coronary heart disease (ARYA Atherosclerosis, via PubMed Central (US National Library of Medicine), 2013).
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Representative model, for educational purposes only.