A cause of low intestinal obstruction due to intestinal trichobezoar is presented. This is a very uncommon entity, specially when there is no simultaneous gastric component. The first description was made by Bertram in 1965, and a few cases have been reported in the literature ever since. Such an obstruction appears in approximately 10% of all the cases of trichobezoar, being more frequent in the female, with a peak incidente at 10 to 19 years of age. There is only one case reported in Mexico. The term Bezoar means antidote and has been classified according to the material with which it is formed. It can be frequently observed in patients with psychiatric disorders. Diagnosis is made under clinical and radiological grounds; treatment is by means of enterostomy or intestinal resection.