Obsessive-compulsive disorder (OCD) refers to Anxiety disorder involving unwanted, persistent, intrusive thoughts and impulses, as well as repetitive actions intended to suppress them.

Other definition:

OCD is the acroynm of Obsessive-compulsive disorder which refers to an anxiety disorder characterized by recurrent obsessions or compulsions that are inordinately time-consuming or that cause significant distress or impairment . People with OCD experiences repeated, intrusive, and unwanted thoughts that cause anxiety and usually engages in ritualized behavior to relieve this anxiety.

Other definition:

Obsessive-compulsive disorder or OCD refers to an anxiety disorder characterized by obsessions (persistent thoughts) and compulsions (rituals); anxiety disorder characterized by recurrent obsessions or compulsions that are inordinately time-consuming or that cause significant distress or impairment. Persistent and uncontrollable thoughts or feelings in which individuals feel compelled to repeat behaviors again and again.

Other definition:

OCD is characterized by uncontrollable intrusive thoughts and action that can only be alleviated by patterns of rigid and ceremonial behavior. Symptoms frequently cause considerable distress and interference with daily social or work activities. There may be a major preoccupation with the smallest of details in daily life. Obsessive ideas frequently involve contamination, dirt, diseases, germs, real / imagined trauma, or some type of frightening / unpleasant theme. People recognize their obsessive ideas do not make sense but are unable to stop them. These obsessive thoughts frequently lead to compulsive behaviors as the person try to prevent or change some dreaded event. They frequently repeating activities over and over again. ( E.g., washing hands, cleaning things up, checking locks )

ONSET: Males: 6 to 15. Females: 20 to 29.

COMMON: Adolescence to early adulthood.

LESS COMMON: Childhood or after 45. 

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