Obsessive-Compulsive Disorder (OCD) causes repeated unwanted thoughts (obsessions) or the urge to do something over and over again (compulsions). Some people can have both obsessions and compulsions. An obsessive thought might be that certain numbers or colors are “good” or “bad”. An example of a compulsion might be to wash your hands seven times after touching something that could be dirty. Although you may not want to think or do these things, you feel powerless to stop. Psychotherapy for OCD includes Cognitive Behavior Therapy (CBT) and Exposure and Response Prevention.