Observational Study of Patients With Moderate to Severe Chronic Plaque Psoriasis

Inclusion Criteria: * Confirmed diagnosis of moderate to severe chronic plaque-type psoriasis diagnosed by a specialist and presence of moderate to severe psoriasis symptoms according to physician's judgement at time of recruitment. * Participant starting any approved treatment for psoriasis and physician's decision must be reached prior to recruitment in the study. * Participant willing to continue with study documentation after cessation of therapy. Exclusion Criteria: * Unwillingness or inability to comply with study requirements. * Participation in an interventional clinical trial, concurrently or within the last 30 days. Participation in a post-market observational study (PMOS) or Registry is acceptable.