What are 4 types of functional disorders?

Functional disorders are conditions where symptoms arise without any identifiable structural or biochemical abnormalities. Four types include irritable bowel syndrome (IBS), which affects the digestive system; fibromyalgia, characterized by widespread musculoskeletal pain; functional neurological disorder (FND), involving neurological symptoms without a clear neurological diagnosis; and chronic fatigue syndrome (CFS), marked by persistent fatigue not improved by rest. These disorders often require a multidisciplinary approach for management and treatment.