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Compulsive behaviors

In order to be diagnosed with obsessive-compulsive disorder, a person's obsessiveness and intrusive thoughts must be accompanied by compulsive behavior, whether it's mental (telling yourself It'll be all right over and over again) or physical (hand-washing, straightening items).

Obsessive thinking and compulsive behavior become a full-blown disorder when the need to complete the behaviors—also known as "rituals"—begins to drive your life, Winston says. "If you like your radio at volume level 3, for example, and it breaks and gets stuck on 4, would you be in a total panic until you could get it fixed?"

Next: Self-doubt