Obsessive Compulsive Disorder is an anxiety disorder characterized by intrusive thoughts that produce uneasiness and the performance of repetitive behaviors to relieve temporary anxiety. It is caused by abnormalities in the orbital cortex of the brain and genetics that can cause different reactions to events. Doctors diagnose OCD using patient reports of symptoms like fears of contamination or harming others, and treatments include medications, psychotherapy, and in severe cases, psychosurgery.