Illness Anxiety Disorder (Health Anxiety, Hypochondria)

What is illness anxiety disorder?

Everyone worries about their health sometimes, especially after a friend's diagnosis or during a pandemic. In illness anxiety disorder the worry is out of proportion, persistent and disabling. A normal sensation such as a skipped heartbeat, a headache or a small lump is interpreted as a sign of cancer, heart disease, multiple sclerosis or another serious illness. Reassurance from a doctor brings relief that lasts hours or days, then the fear returns or moves to a new disease.

Doctors now use two diagnoses for what used to be called hypochondriasis:

Signs and symptoms

• Being preoccupied with having or catching a serious illness for at least 6 months
• High anxiety about health and being easily alarmed by bodily sensations
• Care-seeking type: frequent doctor visits, repeated tests, second and third opinions, and a short-lived sense of relief
• Care-avoidant type: avoiding doctors, scans and hospitals out of fear of what will be found
• Repeatedly checking the body: feeling for lumps, taking your pulse or blood pressure, examining skin or throat
• Searching symptoms online for long periods ("cyberchondria"), which usually increases fear
• Avoiding people, places or activities thought to carry health risks
• Talking about health constantly and seeking reassurance from family
• Doubting reassurance from doctors or normal results

Health anxiety often brings real physical sensations from anxiety itself: heart palpitations, tight chest, dizziness, tingling and stomach upset. These sensations then seem to confirm the fear, creating a cycle.

Causes and risk factors

There is no single cause. Contributing factors include:

• A serious illness in childhood, or a parent or close relative who was seriously ill or died
• Growing up with a parent who worried a lot about health
• Trauma, abuse or a major stressful life event
• A tendency to anxiety and to interpret uncertainty as danger
• Other conditions: generalized anxiety disorder, panic disorder, depression and OCD
• Exposure to frightening health information, including during disease outbreaks

It usually begins in early or middle adulthood.

The health anxiety cycle

1. A trigger: a body sensation, a news story or someone else's illness.
2. A catastrophic thought: "This headache could be a brain tumor."
3. Anxiety, which causes more physical sensations.
4. Safety behaviors: checking, searching online, seeking reassurance or avoiding.
5. Short-term relief, which teaches the brain that the danger was real, so the cycle repeats.

Treatment works by breaking steps 2 and 4.

Health anxiety vs OCD and panic disorder

• OCD: obsessive-compulsive disorder can center on illness or contamination. When intrusive thoughts and rituals extend to many unrelated themes, OCD is the likely diagnosis.
• Panic disorder: fear of dying during a sudden panic attack, which passes when the attack ends. Health anxiety is a more constant worry.
• Body dysmorphic disorder: worry is about appearance, not disease.

How it is diagnosed

A primary care doctor or mental health professional makes the diagnosis by talking with you. A sensible medical check, matched to your symptoms, comes first so that real illness is not missed. Doctors then avoid repeated unnecessary tests, which tend to feed the anxiety. Screening questionnaires such as the Short Health Anxiety Inventory can measure severity.

Treatment

Cognitive behavioral therapy (CBT)

CBT has the strongest evidence. Over about 8 to 16 sessions, a therapist helps you:

• Notice and question catastrophic interpretations of sensations
• Gradually cut down checking, searching and reassurance seeking
• Face avoided situations step by step (exposure)
• Tolerate uncertainty, which is the core skill

Internet-delivered CBT programs for health anxiety also work well. Mindfulness-based approaches and acceptance and commitment therapy (ACT) are alternatives.

Medicines

Selective serotonin reuptake inhibitors (SSRIs), such as fluoxetine or sertraline, can reduce health anxiety, especially when depression, OCD or panic disorder is also present. They take 4 to 8 weeks to work.

A consistent doctor

Seeing one trusted primary care doctor at regular, scheduled visits, rather than many doctors on demand, reduces unnecessary tests and builds trust.

Self-help strategies

• Set a limit on symptom searching, or stop altogether.
• Reduce body checking gradually. Checking makes normal lumps and bumps feel more suspicious.
• Delay reassurance seeking by 30 minutes, then an hour, and notice the anxiety fall on its own.
• Write down the worry, the evidence for and against it, and a balanced alternative.
• Exercise regularly, sleep enough and reduce caffeine, which mimics anxiety symptoms.
• Ask family to respond kindly but not to keep reassuring you.

Outlook

Without treatment, illness anxiety disorder tends to be long-lasting, with ups and downs linked to stress. With CBT, most people see substantial improvement, and many no longer meet the criteria for the disorder after treatment.

Frequently asked questions

What is the difference between hypochondria and illness anxiety disorder?

Hypochondria (hypochondriasis) is the older term. In 2013 the DSM-5 replaced it with two diagnoses: illness anxiety disorder, when there are few or no physical symptoms and the main problem is fear of disease, and somatic symptom disorder, when distressing physical symptoms are the focus.

How do I stop health anxiety?

The most effective approach is cognitive behavioral therapy, which teaches you to question catastrophic thoughts and gradually reduce checking, online searching and reassurance seeking. Self-help books and online CBT programs based on the same methods also help. An SSRI antidepressant may be added for more severe cases.

Can health anxiety cause real physical symptoms?

Yes. Anxiety triggers the stress response, which can cause a racing heart, chest tightness, dizziness, tingling, stomach upset, headaches and muscle tension. These sensations are real, not imagined, and they often seem to confirm the fear of illness. Recognizing them as anxiety symptoms helps break the cycle.

Is illness anxiety disorder a form of OCD?

No, but they are closely related and can occur together. Both involve intrusive worries and repetitive behaviors such as checking and reassurance seeking. Illness anxiety disorder focuses specifically on having a serious disease, while OCD usually involves several different themes and rituals.

Should someone with health anxiety still see a doctor for new symptoms?

Yes. People with health anxiety can still get physical illnesses. A new, persistent or changing symptom deserves assessment. The goal is planned, proportionate checks with one trusted doctor, rather than repeated tests for the same worry or avoiding care altogether.