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.