Obsessive Compulsive Disorder

Obsessive–compulsive disorder (OCD) is a mental disorder characterized by intrusive thoughts that produce anxiety, by repetitive behaviors aimed at reducing anxiety, or by a combination of such thoughts and behaviors.
The symptoms of this anxiety disorder may include touching objects a certain number of times to ward off a feeling of dread. These symptoms can be alienating and time-consuming, and often cause emotional and economic loss. The acts of those who have OCD may appear paranoid and come across to others as psychotic. However, OCD sufferers generally recognize their thoughts and resulting actions are irrational, and they may become further distressed by this realization.

OCD is the fourth-most common mental disorder and is diagnosed nearly as often as asthma and diabetes mellitus. In the United States, one in 50 adults have OCD. The phrase “obsessive–compulsive” has become part of the English lexicon, and is often used in an informal or caricatured manner to describe someone who is meticulous, perfectionistic, absorbed in a cause, or otherwise fixated on something or someone.[3] Although these signs may be present in OCD, a person who exhibits them does not necessarily have OCD, and may instead have obsessive–compulsive personality disorder (OCPD), an autism spectrum disorder, or no clinical condition. Multiple psychological and biological factors may be involved in causing obsessive–compulsive syndromes.

Source: http://en.wikipedia.org/wiki/Obsessive–compulsive_disorder

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