Obsessive-compulsive disorder (OCD) is an anxiety disorder in which a person becomes trapped in a pattern of intrusive and unwanted thoughts and repeatedly performs tasks or rituals to get rid of the thoughts. Fear of contamination is one of the most common obsessions, and hand-washing and checking that something has been done are the most common compulsions.
In a person with obsessive-compulsive disorder, attempts to control his or her obsessions and resist the urge to perform certain compulsive behaviors may cause extreme anxiety or panic attacks.
Treatment includes medicines and counseling.
WebMD Medical Reference from Healthwise