Obsessive-compulsive disorder (OCD)

Obsessive-compulsive disorder (OCD) is a psychiatric disorder most commonly characterized by a subject's obsessive, distressing, intrusive thoughts and related compulsions (tasks or "rituals") which attempt to neutralize the obsessions. Thus it is an anxiety disorder. It is listed by the World Health Organization as one of the top ten most disabling illnesses in terms of lost income and diminished quality of life.