Obsessive-compulsive disorder (OCD) is a common mental health condition in which a person has obsessive thoughts and compulsive behaviours, often leading to an anxious state of mind. It affects men, women and children, and can develop at any age. Some people develop the condition early, often around puberty, but it typically develops during early adulthood. OCD can be distressing and significantly interfere with an individual’s life, but treatment can help keep it under control.