We all have nagging worries - did I turn off the stove? Did I lock the door? But for Canadians with obsessive-compulsive disorders, these thoughts get stuck, playing over and over in the mind like a broken record. And the only way to lower the volume is to perform rituals - behaviours such as constant checking, excessive washing or extreme hoarding to control the unwanted thoughts. Symptoms can be so severe that that some patients are unable to hold down jobs, go to school or even leave their homes.