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Author: Priyanka Handa, Fifth Year Medical Student. University of Auckland, New Zealand. 2019. Copy edited by Gus Mitchell. Revised October 2020.
Trichophagia is the repeated ingestion of hair most commonly associated with compulsive hair pulling (trichotillomania). It can involve eating parts of one’s own hair (such as the roots or tips) or whole strands of hair. Less commonly, trichophagia may involve the eating of hair of other people, animal hair, hair extensions, or brush bristles.
It is estimated that trichophagia occurs regularly or intermittently in approximately 30% of patients with trichotillomania. Trichophagia is most commonly seen in children and adolescents. Although trichotillomania is seen predominantly in females, some studies have reported trichophagia to be more common in males.
Trichophagia is likely to be the cumulative result of multiple factors, such as genetic predisposition, social environment, and neurobiological factors. There are several psychoanalytic theories and associations, although none are supported by empirical evidence.
Trichophagia may present with symptoms of abdominal pain, nausea, vomiting, recurrent diarrhoea or constipation, and weight loss due to formation of a trichobezoar.
A diagnosis of trichotillomania may have already been made, or signs of hair pulling noted on examination.
Trichophagia may have been observed.
Trichobezoars are the usual reason for medical presentation of trichophagia. A trichobezoar consists of an accumulation of the ingested hair and food matter in the stomach, and typically takes years of trichophagia to form. The trichobezoar may extend further along the gastrointestinal tract into the small bowel and colon; the 'Rapunzel syndrome'.
The clinical features of a trichobezoar include:
Complications of a trichobezoar can include:
The diagnosis of trichophagia is usually only made following the demonstration of a trichobezoar. A dermatological and psychiatric assessment confirms the diagnosis of trichotillomania with trichophagia.
Plain radiographs may show the mass localised in the stomach and the addition of contrast has a typical appearance. Abdominal CT provides an accurate diagnosis in around 97% of trichobezoars. Gastroscopy provides the hair-containing material from the mass to distinguish this from other forms of bezoar.
Treatment of trichophagia includes:
Trichobezoar can be life-threatening and requires immediate treatment. Following the removal of a trichobezoar, the prognosis is relatively good if psychotherapy and medical treatment is maintained. Trichophagia may persist or recur.
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