Effectiveness of ICBT for Severe Health Anxiety in Clinical Psychiatry.

Inclusion Criteria: * Patients over 16 years of age * Living in Sweden * Primary diagnosis of hypochondriasis according to ICD-10 * Able to read and write * Have access to a computer or other device with an Internet connection * If on medication, have a stable dose of psychotropic medication for 4 weeks prior to treatment * Not having other psychiatric difficulties (e.g., ongoing substance abuse or a psychotic syndrome) that makes ICBT an unsuitable intervention Exclusion Criteria: * Patients with severe depression (clinician rated Montgomery-Asberg Depression Rating Scale- Self-Rated; MADRS-S and/or moderate to high risk of suicide in which monitoring is required * Patients with low motivation, severe apathy, or difficulty concentrating * Patients with psychosis * Patients with untreated drug or alcohol problems * Patients with reading and/or writing difficulties, including language difficulties;