“Pure O” is not a formal mental health diagnosis. It refers to a form of OCD in which people may have compulsions that involve mental rituals more so than specific actions. Although pure obsessional ...

Obsessive-compulsive disorder (OCD) causes people to have recurrent unwanted or unreasonable thoughts or sensations (obsessions) or make them feel driven to do something repeatedly (compulsions).

The term obsessive obsessive-compulsive disorder is not well understood and is sometimes thrown around casually. Someone who likes cleanliness and order may say, “I am so OCD about how I organize my ...