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Mental Health · Guide

Health Anxiety & Illness Anxiety Disorder

Health anxiety involves excessive worry about having or developing a serious illness. Learn what cau...

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Last reviewed May 2026 · Editorial standards

Understanding health anxiety

Health anxiety (formerly called hypochondria, now termed illness anxiety disorder) involves persistent worry about having or developing a serious illness despite reassurance and negative medical tests. It affects approximately 4-5% of the population and is associated with significant impairment and increased healthcare utilization.

The reassurance trap

Seeking reassurance — from doctors, the internet, loved ones — provides brief relief but maintains and worsens health anxiety over time. Each reassurance-seeking episode reinforces the belief that checking is necessary and that uncertainty is intolerable. Effective treatment paradoxically involves learning to tolerate uncertainty rather than eliminating it through testing.

Health anxiety and medical illness are not mutually exclusive. People with health anxiety can also have real medical conditions. The goal of treatment is not to dismiss medical concerns but to develop a more accurate and less catastrophic relationship with symptoms and uncertainty.

Frequently asked questions
They refer to the same basic condition — DSM-5 replaced 'hypochondria' with illness anxiety disorder and somatic symptom disorder. The change reflected the goal of reducing stigma. The core features — excessive worry about illness, reassurance-seeking, and misinterpretation of bodily sensations — are the same.
Yes — CBT specifically targeting health anxiety is highly effective. It addresses the cognitive distortions (catastrophizing, intolerance of uncertainty) and behavioral patterns (reassurance-seeking, body checking, avoidance) that maintain health anxiety. Response rates are high with an adequate course of treatment.
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