Trichotillomania is a condition where a person feels compelled to pull their hair out.
They may pull out the hair on their head or in other places, such as their eyebrows or eyelashes.
Trichotillomania is an impulse-control disorder, a psychological condition where the person is unable to stop themselves carrying out a particular action.
Some people with trichotillomania chew and swallow the hair they pull out. This is known as trichophagia. Eating hair causes hair balls called trichobezoars to form in the stomach or bowel.