Compulsions are repetitive behaviors (e.g., hand washing, ordering, checking) or mental acts (e.g., praying, counting, repeating words silently) that the individual feels driven to perform in response to an obsession or according to rules that must be applied rigidly. The behaviors or mental acts are aimed at preventing or reducing anxiety or distress, however, not connected in a realistic way with what they are designed to neutralize or prevent, or are clearly excessive.

Treatment with psychotherapy and medications, such as antidepressants, have been proven to effective in the management of obsessive-compulsive disorders.