Recurrent obsession or compulsions sufficiently severe to cause marked distress, be time-consuming, or significantly interfere with the person's normal routine, occupational functioning, or usual social activities or relationships with others. Obsessions are persistent ideas, thoughts, impulses, or images that are experienced as intrusive and senseless. The person recognizes that the obsession are the product of his/her mind. Compulsions are repetitive, purposeful, and intentional behaviors that are performed in response to an obsession, according to certain rules, or in a stereotyped fashion. The most common compulsions involve hand washing, counting, checking, and touching.