A person with obsessive-compulsive disorder (OCD) has the same thoughts, images, or impulses-also called obsessions-over and over again. The person finds these obsessions intrusive, senseless, and disturbing. He/she does not want to have them but feels that he/she has no control over them. A person with OCD a lso develops compulsions to counteract the obsessions. He or she does certain things over and over again to lessen the anxiety and worry caused by the obsessions.