Health Anxiety (Illness Anxiety Disorder)

vs. Somatic symptom disorder (SSD)

SSD centers on distressing SOMATIC symptoms that are actually present (pain, fatigue, GI symptoms) plus excessive thoughts/behaviors about them. Illness anxiety disorder centers on the FEAR of illness with minimal or no somatic symptoms. The presence and prominence of actual bodily symptoms is the dividing line. The two replaced DSM-IV hypochondriasis between them.

vs. Obsessive-compulsive disorder (OCD)

OCD involves intrusive obsessions and compulsions across varied themes; the compulsions (checking, reassurance) are ego-dystonic and recognized as excessive. Health anxiety can resemble OCD (body-checking as a compulsion), and ICD-11 actually groups hypochondriasis with OCD. The distinction in practice: in IAD the content is exclusively illness-focused and the belief is often less clearly recognized as irrational. Substantial overlap; some patients meet both.

vs. Generalized anxiety disorder (GAD)

GAD worry spans many domains (finances, work, relationships, health); illness anxiety disorder worry is specifically and persistently about having or getting a serious disease. If health is just one of many worry domains, GAD is the better fit. Both can co-occur.

vs. Panic disorder

Panic disorder patients fear the acute catastrophe of an attack (heart attack, dying) in the moment; IAD patients have a sustained, between-episode preoccupation with having an underlying disease. The time course differs — acute discrete fear versus chronic preoccupation. Patients with panic may develop secondary health anxiety about what the attacks mean.

Cognitive-behavioral therapy for health anxiety (CBT-HA)

First-line and best-evidenced treatment. CBT for health anxiety targets catastrophic misinterpretation of benign bodily sensations, the reassurance-seeking and body-checking cycle, and the selective attention to health threat. Treatment deliberately reduces reassurance-seeking (which maintains the disorder) and uses behavioral experiments and exposure to health-related triggers. Effect sizes are robust in randomized trials; gains are durable.

Internet-delivered CBT (ICBT)

Therapist-guided internet-delivered CBT for health anxiety has randomized-trial evidence of efficacy comparable to face-to-face treatment (Axelsson and colleagues, JAMA Psychiatry). Highly relevant because health-anxious patients are often dispersed and may avoid in-person care; ICBT improves access and scalability while retaining effectiveness.

SSRIs (fluoxetine, sertraline, escitalopram, paroxetine)

First-line pharmacotherapy with controlled-trial support. The landmark Fallon and colleagues trial demonstrated efficacy of fluoxetine, of CBT, and of their combination for hypochondriasis/health anxiety. SSRIs reduce the anxiety and preoccupation directly. Standard antidepressant onset (4-8 weeks) and duration considerations apply; continue 6-12 months after response.

Combined CBT plus SSRI

For moderate-to-severe or treatment-resistant health anxiety, combining CBT with an SSRI is supported by the Fallon trial and is a reasonable first choice when severity is high. The combination addresses both the cognitive-behavioral maintenance cycle and the underlying anxiety physiology.

Reassurance-reduction and a single coordinated medical home

A practical, evidence-consistent management strategy: consolidate care under one trusted clinician who provides scheduled, predictable visits rather than symptom-triggered ones, and who minimizes repeated low-yield testing. This breaks the doctor-shopping and serial-investigation cycle that reinforces health anxiety, while ensuring genuine new symptoms are still appropriately evaluated.

Mindfulness-based and acceptance approaches

Mindfulness-based cognitive therapy and acceptance and commitment therapy shift the relationship to health-related thoughts (observing them without compulsive response) rather than disputing each feared illness. Useful adjuncts or alternatives for patients who have plateaued in standard CBT-HA or who prefer an acceptance-based framing.

Is illness anxiety disorder the same as hypochondria?

It is the modern successor to most of what used to be called hypochondriasis. DSM-5-TR split the old hypochondriasis diagnosis into two: people with prominent real physical symptoms are now diagnosed with somatic symptom disorder, while those with minimal symptoms but a strong, persistent fear of being or becoming seriously ill are diagnosed with illness anxiety disorder. The term "hypochondriasis" is now largely retired in DSM-5-TR, though ICD-11 still uses it.

Why does getting reassurance from my doctor only help for a little while?

Reassurance-seeking is one of the behaviors that actually maintains health anxiety. The relief it provides is brief, and seeking it reinforces the underlying belief that you need external checking to feel safe — so the anxiety returns and the cycle repeats, often escalating. This is why effective treatment deliberately works on reducing reassurance-seeking and repeated testing, while still ensuring genuinely new symptoms get appropriate evaluation.

Can ketamine help my health anxiety?

No — ketamine is not a treatment for health anxiety (illness anxiety disorder), and we will not present it as one. There is no trial evidence for it in this condition, and the disorder responds to cognitive-behavioral therapy adapted for health anxiety plus SSRIs. Ketamine would only be relevant if you separately have a treatment-resistant major depression, in which case it treats the depression, not the health anxiety. The dissociative experience of ketamine can even briefly heighten body-focused anxiety, so it is not directed at the health anxiety itself.

What kind of therapy works for health anxiety?

Cognitive-behavioral therapy specifically adapted for health anxiety (CBT-HA) is first-line and well-supported by randomized trials, including therapist-guided internet-delivered versions that work about as well as in-person sessions. It targets the catastrophic interpretation of normal body sensations, the body-checking and reassurance-seeking cycle, and the selective focus on health threat. Mindfulness- and acceptance-based approaches are reasonable alternatives or add-ons.

How is health anxiety different from OCD?

They overlap, and ICD-11 actually groups hypochondriasis with obsessive-compulsive and related disorders. The practical difference is content and insight: in illness anxiety disorder the worry is exclusively about having or getting a serious disease and the belief is often held with less recognition that it is excessive, whereas OCD spans varied themes with compulsions the person usually recognizes as irrational. Body-checking in health anxiety can look just like an OCD compulsion, and some people meet criteria for both.