The patients referred are initially screened for inclusion by a telephone interview of a specialist in psychiatry (MS). The telephone interview consist of direct questions for the inclusion and exclusion criteria, WI-7, the diagnostic criteria for severe health anxiety and seeking verbal consent to send the first online questionnaire. Each patient fulfilling the inclusion is assessed by use of the SCAN interview (Schedules for Clinical Assessment in Neuropsychiatry), which is a thorough semi-structured diagnostic interview recommended by the WHO and is applied in the diagnostics of general mental disorders as defined by ICD-10 and DSM-IV criteria [50], and by use of the SCID II [51], which is a semi-structured diagnostic interview for personality disorders developed for DSM-IV. Just before the semi-structured interviews are performed a non-structured clinical interview and assessment is performed and ended by psychoeducation and the joint creation of the individual illness model for cognitive behaviour therapy. Global assessment of functioning (GAF-F) and diagnostic assessment using DSM-V, ICD-10 and the criteria for severe health anxiety will also be performed in this initial clinical assessment. The clinical and diagnostic interviews are performed by a specialist in psychiatry (MS), certified at the SCAN training centre in Copenhagen and trained in SCID-II assessment before project start. If needed a second opinion on the patients from another medical doctor at the clinic in Koege is possible (JS). For inter-rater-reliability assessment 5% of the patients are similarly clinically assessed by a blinded second rater and specialist in psychiatry. After the patients have answered the 5. online questionnaire (6 month after end of treatment), they are diagnostically assessed for severe health anxiety with direct questions for the diagnostic criteria for severe health anxiety in a telephone interview performed by a blinded second rater and specialist in psychiatry. Right after this telephone interview MS will see the patients in the clinic as a conclusion of the treatment and a possibility for the patient to be referred to further psychotherapeutic treatment, if it is indicated by a comorbid mental disorder and wanted by the patient.