organic illnesses

Is Depression Organic Or Functional? Psychiatric illnesses are also largely considered functional since we cannot readily identify their underlying cause. These include clinical depression, bipolar disorder, schizophrenia, attention deficit hyperactivity disorder (ADHD), obsessive-compulsive disorder (OCD), and post-traumatic stress syndrome (PTSD). What is the difference between functional and organic mental disorder? As currently used, ‘organic’ tic