||It has been suggested that Trichobezoar be merged into this article. (Discuss) Proposed since May 2013.|
A hairball is a small collection of hair or fur formed in the stomach of animals that is occasionally vomited up when it becomes too big. Hairballs are primarily a tight elongated cylinder of packed fur, but may include bits of other elements such as swallowed food. Hairballs are sometimes mistaken for other conditions of the stomach such as lymphosarcoma, tuberculosis, and tumour of the spleen. Cats are especially prone to hairball formation since they groom themselves by licking their fur, and thereby ingest it. Rabbits are also prone to hairballs because they groom themselves in the same fashion as cats, but hairballs are especially dangerous for rabbits because they cannot regurgitate them. Because the digestive system of a rabbit is very fragile, rabbit hairballs must be treated immediately or they may cause the animal to stop feeding and ultimately die due to dehydration. Cattle are also known to accumulate hairballs, but as they do not vomit, these are found usually after death and can be quite large.
Although uncommon in humans, some hairballs have been reported. These hairballs occur when hair strands collect in the stomach and are unable to be ejected as a result of the friction on the surface of the gastric mucosa. Hairballs are often seen in young girls as a result of trichophagia, trichotillomania and pica. In 2003, a 3-year old girl in Red Deer, Alberta, Canada had a grapefruit-sized hairball surgically removed from her stomach; and in 2004, an 18-year old woman from McAdam, New Brunswick, Canada, had a 2.3 kg (5.1 lb) hairball surgically removed from her lower intestine.[verification needed] Hairballs can be quite hazardous in humans, since hair cannot be digested or passed by the human gastrointestinal system, and (assuming it is identified) even vomiting may be ineffective at removing the hair mass. This can result in the general impairment of the digestive system.
- Rolleston, JD (1924). "Specimen of Hair-ball of the Stomach.". Proceedings of the Royal Society of Medicine 17 (Section for the Study of Disease in Children.): 5. PMC 2201872.
- Santiago, Sanchez CA (1996). "Trichobezoar in a 11-year old girl: a case report.". Boletin de la Asociacion Medica de Puerto Rico 88 (1-3): 8. PMID 8885440.
- Hairballs: Myths and Realities behind some Medical Curiosities, National Museum of Health and Medicine, Washington, D.C.
- "Talk about a Hairball!!!". Forums.dealofday.com. 2003-11-13. Retrieved 2011-02-09.
- Girl died from eating her hair, BBC News, 1999-08-20
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