Doctors say a brain injury brought on OCD: case report

The patient's mother noticed the behaviours shortly after discharge from hospital following a car accident.

Doctors believe a traumatic brain injury gave rise to obsessive–compulsive disorder in a young man who began hoarding deodorant and completing tasks in a “ritualistic manner” after a long stay in hospital. 

The team, from the University of Calgary in Canada, said their patient had sustained serious injuries in a car accident during his late adolescence.