Obsessive-compulsive disorder

#### Summary points Obsessive-compulsive disorder (OCD) is characterised by the presence of obsessions or compulsions, or commonly of both. OCD is the fourth most common mental disorder after depression, alcohol/substance misuse, and social phobia, with a lifetime prevalence in community surveys of 1.6%.1 The severity of OCD differs markedly from one person to another. People are often able to hide their OCD, even from their own family,...