This page is for general education and is not medical advice. It is not a substitute for diagnosis or treatment by a qualified professional. If this is an emergency, call 911 or 988.
Illness anxiety disorder — often called health anxiety — is a persistent preoccupation with having or developing a serious illness, even when physical symptoms are mild or absent. Medical reassurance brings only brief relief before the worry returns. The fear is genuinely distressing and not a sign of being dramatic, and it responds well to treatment that targets the anxiety itself.
Key facts
- The core feature is excessive worry about serious illness that persists despite few or no symptoms and despite medical reassurance (MedlinePlus).
- It is distinct from somatic symptom disorder, where the focus is on distressing physical symptoms rather than the fear of disease.
- People often over-check their bodies and seek frequent reassurance or, conversely, avoid doctors out of fear.
- It is closely related to other anxiety conditions and is treatable.
What it is
Everyone worries about their health sometimes. Illness anxiety disorder is when that worry becomes persistent, out of proportion, and disruptive — dominating attention, driving repeated checking or testing, and straining daily life. The body sensations people notice are usually normal, but anxiety amplifies and reinterprets them as evidence of danger, which fuels more worry.
Symptoms
- Preoccupation with having or getting a serious disease
- High anxiety about health, with body sensations seen as alarming
- Repeatedly checking the body for signs of illness
- Frequent reassurance-seeking from doctors, family, or the internet
- Or the opposite: avoiding medical care because it is too frightening
- Worry that continues despite normal test results
Causes
Illness anxiety often develops from a mix of factors: a tendency toward anxiety, past experiences of serious illness in oneself or a loved one, childhood experiences around health, and periods of high stress. A heightened sensitivity to body sensations and a habit of interpreting them as threatening play a central role.
How it is treated
Cognitive behavioral therapy (CBT) is the most effective treatment. It helps you respond differently to health worries, reduce checking and reassurance-seeking, and tolerate uncertainty about your body without spiraling. Some people also benefit from medication used for anxiety. The aim is to treat the anxiety — not to keep ordering tests that calm the fear for only a moment.
From our clinical review. People come in braced to defend that their fear is reasonable, and I never argue that. The fear is real. What we change is the relationship to it — because more tests and more reassurance feed the worry rather than settle it. Learning to sit with uncertainty is hard, and it is exactly what frees people.
If health worries are taking over your thoughts and time, effective help is available — and it focuses on easing the fear, not chasing it. Learn about CBT, explore anxiety more broadly, find care with Find Help by State, or talk to someone about what you are going through.
Frequently asked questions
What is illness anxiety disorder?
Illness anxiety disorder, sometimes called health anxiety, is a persistent preoccupation with having or developing a serious illness, even though physical symptoms are mild or absent. The worry continues despite reassurance and medical evaluation, and it causes real distress.
Is illness anxiety disorder the same as hypochondria?
It overlaps with the older term hypochondria. Today, intense health worry with few physical symptoms is usually classed as illness anxiety disorder, while worry centered on distressing physical symptoms is classed as somatic symptom disorder. A clinician can clarify which fits.
How is illness anxiety disorder treated?
Cognitive behavioral therapy is the most effective approach, helping reduce health-related fear, checking, and reassurance-seeking. Some people also benefit from medication for anxiety. The fear is real and treatable, and care focuses on the anxiety rather than chasing more tests.
Sources
- Illness anxiety disorder — MedlinePlus, U.S. National Library of Medicine
- Anxiety — MedlinePlus, U.S. National Library of Medicine
- Anxiety — American Psychological Association (APA)
Reviewed against the sources above. This page is educational and is not medical advice.