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Obsessive–compulsive disorder (OCD) is an anxiety disorder characterized by intrusive thoughts that produce uneasiness, apprehension, fear, or worry; by repetitive behaviors aimed at reducing the associated anxiety; or by a combination of such obsessions and compulsions. Symptoms of the disorder include excessive washing or cleaning; repeated checking; extreme hoarding; preoccupation with sexual, violent or religious thoughts; relationship-related obsessions; aversion to particular numbers; and nervousrituals, such as opening and closing a door a certain number of times before entering or leaving a room. These symptoms can bealienating and time-consuming, and often cause severe emotional and financial distress. The acts of those who have OCD may appearparanoid and potentially psychotic. However, OCD sufferers generally recognize their obsessions and compulsions as irrational and may become further distressed by this realization. http://en.wikipedia.org/wiki/Ocd