"Obsessive-compulsive disorder (OCD) is characterized by repetitive, unwanted, intrusive thoughts (obsessions) and irrational, excessive urges to do certain actions (compulsions) that interfere with daily life. OCD can affect people of any age, including teens and adults. Although individuals with OCD may know that their thoughts and behavior do not make sense, they are often unable to stop them."
- National Alliance on Mental Illness