Hypochondria, now formally called illness anxiety disorder (IAD) in the DSM-5, is characterized by a persistent preoccupation with having or developing a serious medical condition. People with this disorder experience significant distress about their health that is out of proportion to any actual medical risk. The worry continues even after thorough medical evaluations and reassurance from healthcare providers.

Common signs and symptoms include:

• Excessive worry about health. Persistent thoughts about having a serious disease, such as cancer, heart disease, or a neurological condition, dominate daily thinking.
• Body checking and monitoring. Frequently examining oneself for lumps, rashes, sores, pain, or changes in heart rate or other body functions.
• Reassurance seeking. Repeatedly asking doctors, family members, or friends whether symptoms could indicate a serious problem. Relief after reassurance is brief.
• Internet and medical research. Spending hours reading about diseases and matching symptoms to what is found online, a behavior sometimes called "cyberchondria."
• Avoidance behavior. Some individuals avoid doctors, hospitals, or health-related information because the anxiety it triggers feels overwhelming. Others do the opposite and seek frequent medical appointments.
• Functional impairment. Difficulty concentrating at work or school, withdrawing from social activities, and disrupted sleep due to health worries.
• Misinterpretation of normal sensations. Ordinary body signals, like a muscle twitch, mild headache, or digestive gurgling, are interpreted as evidence of serious disease.

For a diagnosis of illness anxiety disorder, symptoms must persist for at least six months, though the specific feared illness may change over that period. The condition is distinct from somatic symptom disorder, in which significant physical symptoms are present.

Diagnosis

Illness anxiety disorder is diagnosed by a qualified mental health professional or physician using criteria from the DSM-5. The evaluation typically includes a thorough clinical interview, a review of medical history, and an assessment of the frequency and intensity of health-related worries. The clinician will confirm that the preoccupation has lasted six months or more, that physical symptoms are either absent or very mild, and that the anxiety is not better explained by another mental health condition such as generalized anxiety disorder, obsessive-compulsive disorder, or panic disorder.

It is important that a medical provider first rules out any genuine physical conditions. Once medical causes have been reasonably excluded, the focus shifts to addressing the psychological pattern driving the distress.

Treatment

Illness anxiety disorder is treatable. The approaches with the strongest evidence base include:

• Cognitive behavioral therapy (CBT). CBT is the first-line treatment. It helps individuals identify and restructure catastrophic thoughts about health, reduce body-checking and reassurance-seeking behaviors, and develop healthier ways of responding to uncertainty about physical sensations.
• Exposure and response prevention (ERP). A component often used within CBT, ERP involves gradually confronting feared health scenarios (for example, reading about a disease without immediately checking for symptoms) while resisting compulsive safety behaviors.
• Behavioral stress management. Techniques such as progressive muscle relaxation, diaphragmatic breathing, and mindfulness meditation can lower the general arousal level that fuels health anxiety.
• Psychoeducation. Learning how the anxiety cycle works, how the brain amplifies body signals under stress, and how reassurance-seeking maintains rather than resolves worry can be profoundly helpful.

A collaborative relationship between the person, their therapist, and their primary care provider often leads to the best outcomes. Regular but scheduled (rather than symptom-driven) medical check-ups can provide structure and reduce the urge for frequent unplanned visits.

Worrying about your health from time to time is a normal part of life. However, when that worry becomes persistent, difficult to control, and starts to interfere with your daily functioning, it may be time to seek professional support.

Consider reaching out to a mental health professional if:

• You spend several hours each week worrying about illnesses despite reassurance from doctors.
• You find yourself repeatedly checking your body or searching for symptoms online and feel unable to stop.
• Your health fears are affecting your work performance, relationships, or ability to enjoy activities you once found pleasurable.
• You feel trapped in a cycle where medical reassurance provides only temporary relief before the worry returns.
• You are avoiding medical care altogether because the anxiety about what might be found feels unbearable.
• You have experienced these patterns for six months or longer.

A good starting point is to speak with your primary care doctor, who can help coordinate care with a therapist experienced in anxiety disorders. You do not need to manage this alone, and effective help is available.

For more information about illness anxiety disorder and related conditions, visit these resources:

• Mayo Clinic: Illness Anxiety Disorder
• National Institute of Mental Health: Anxiety Disorders
• NHS: Health Anxiety