Can People With OCD Also Have Other Illnesses?

OCD is sometimes accompanied by depression, eating disorders, substance abuse, attention deficit hyperactivity disorder, or other anxiety disorders. When a person also has other disorders, OCD is often more difficult to diagnose and treat. Symptoms of OCD can also coexist and may even be part of a spectrum of other brain disorders, such as Tourette's syndrome. Appropriate diagnosis and treatment of other disorders are important to successful treatment of OCD.