Eating your hair. Some people who pull out their hair actually eat the pulled-out hair. Some eat just the root of the hair, and some eat the entire hair shaft. This isn’t a harmless obsession, however, People who eat hair can develop clogged intestines due to big hairballs that form in the gut. Many with the habit need life-saving surgery to remove the hairballs. If you eat your own hair, see a doctor immediately.
Nail biting. Most people have bitten their nails at times, particularly in their youth. Yet if it becomes excessive, leading to painful fingernail beds, the condition, can become a health problem. Doctors who specialize in obsessive-compulsive disorders can help patients recognize the triggers for their behaviors and develop alternative ways to relieve their stress.