Trichobezoar
Encyclopedia
A trichobezoar is a bezoar
Bezoar
A bezoar is a mass found trapped in the gastrointestinal system , though it can occur in other locations. A pseudobezoar is an indigestible object introduced intentionally into the digestive system....

 (a mass found trapped in the gastrointestinal system) formed from the ingestion of hair. Trichobezoars are often associated with trichotillomania
Trichotillomania
Trichotillomania, which is classified as an impulse control disorder by DSM-IV, is the compulsive urge to pull out one's own hair leading to noticeable hair loss, distress, and social or functional impairment. It is often chronic and difficult to treat....

(compulsive hair pulling), are rare, and can be fatal if undetected. Surgical intervention is often required.
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