DISTRESS Trial Functional Disorders - the DISTRESS Trial

Study population: Participants were drawn from the population of the Central Denmark Region. To be considered for inclusion, patients had to be referred by their GP. Inclusion Criteria: * Being referred to the clinic by their GP due to symptoms consistent with a possible diagnosis of moderate or severe FSD. * Symptoms having been present for at least 6 months and no more than 3 years. * Having undergone at least 2 diagnostic evaluations (e.g. imaging studies or specialist evaluations) at physical specialty clinics or hospitals in the past year. * Age 18-60. * Being of ethnic western cultural upbringing. * Understands and speaks Danish fluently. Exclusion Criteria: * Having another severe chronic disease which explains the reduced level of functioning. * Having been previously referred to or evaluated for FSD at this or another clinic specializing in functional disorders. * Previous diagnosis of FSD. * Alcohol or other substance-dependency or -abuse. * Emergent psychiatric illness or emergent elevated risk of harm to self or others requiring psychiatric evaluation for possible need of acute or sub-acute psychiatric hospitalization. * Current or prior diagnosis of psychosis (ICD10 F2x diagnosis), bipolar affective disorder (ICD10 F31.x diagnosis) or depression with psychotic symptoms (ICD10 F32.3 or F33.3 diagnosis). * Currently pregnant.