What Is Obsessive-Compulsive Disorder?

Obsessive-compulsive disorder (OCD) is a disorder in which people have recurring, unwanted thoughts, ideas or sensations (obsessions) that make them feel driven to do something repetitively (compulsions). The repetitive behaviors, such as hand washing, checking on things or cleaning, can significantly interfere with a person’s daily activities and social interactions.

Many people without OCD have distressing thoughts or repetitive behaviors. However, these thoughts and behaviors do not typically disrupt daily life. For people with OCD, thoughts are persistent, and behaviors are rigid. Not performing the behaviors commonly causes great distress. Many people with OCD know or suspect their obsessions are not realistic; others may think they could be true (known as limited insight). Even if they know their obsessions are not realistic, people with OCD have difficulty disengaging from the obsessive thoughts or stopping the compulsive actions.

A diagnosis of OCD requires the presence of obsessions and/or compulsions that are time-consuming (more than one hour a day), cause significant distress, and impair work or social functioning. OCD affects 2-3% of people in the United States, and among adults, slightly more women than men are affected. OCD often begins in childhood, adolescence, or early adulthood; the average age symptoms appear is 19 years old.