Obsessive Compulsive Disorder (OCD) is an anxiety disorder that affects 1-3% of the population equally among males and females. Sigmund Freud believed that OCD stemmed from issues with potty training as a child. Therapists now use various approaches including trait, biological, humanistic, behavioral, cognitive, and exposure response prevention to understand and treat OCD. Treatment focuses on helping clients gain self-esteem and reduce anxiety when confronting obsessive thoughts and compulsions.