Trichophagia is the habit of eating a hair diet.

Cnn reported that, the current New England Journal of Medicine has documented a case of a patient who had Trichophagia, whereby she had the habit of eating her hair for many years.

She underwent surgery and the doctors removed a 10 pound mass of hairball which had caused her weight loss, pain and vomiting every time she ate food.
The good news is that the patient has recovered and the pain and vomiting has stopped. She has even put on weight and has stopped eating her hair.