Those that suffer from OCD often have thoughts that seem out of their control that last a long time, and are very strong. The anxiety they feel seems overwhelming and the sufferer goes out of their way to do certain things over and over again. These rituals begin to overtake them and often times rule their lives.
OCD is often effectively treated with a combination of therapy, medication and behavior modification as well as psychotherapy. Depending on the severity and the sufferer, the combination used to treat the condition will vary. I want to give you counseling if you have Obsessive-Compulsive Disorder.