Obsessive-compulsive disorder (OCD) is a neurological illness that causes psychiatric symptoms, the fourth most common diagnosis of this type in children. Other brain-based disorders can be linked to OCD, particulary Tourett' syndrome and attention deficit disorders (ADHD/ADD). Psychiatrists often categorize people who have common OCD behaviors as 'counters', 'cleaners', 'checkers' or 'hoarders'. This is not a minor problem or a personality quirk. An estimated 2,5 to 5 million people have OCD, including perhaps 1 in 100 children and teens. It's a truly debilitating illness that often causes extreme anxiety and embrarassment, preventing young people from building good relationships, doing well in school, and having a normal childhood. The good news is that OCD is very treatable.