A bezoar is a mass found trapped in the gastrointestinal system,[2] though it can occur in other locations.[3][4] A pseudobezoar is an indigestible object introduced intentionally into the digestive system.[5]

Bezoar stones were seen as valuable commodities, sometimes with magical healing properties, as in the early modern English case Chandelor v Lopus[1]
  • /ˈbzɔːr/
SpecialtyEmergency medicine 

There are several varieties of bezoar, some of which have inorganic constituents and others organic. The term has both a modern (medical, scientific) and a traditional usage.


By content

  • Food boluses (or boli; singular bolus) carry the archaic and positive meaning of bezoar, and are composed of loose aggregates of food items such as seeds, fruit pith, or pits, as well as other types of items such as shellac, bubble gum, soil, and concretions of some medications.
  • Lactobezoar is a specific type of food bezoar comprising inspissated milk. It is most commonly seen in premature infants receiving formula foods.
  • Pharmacobezoars (or medication bezoars) are mostly tablets or semiliquid masses of drugs, normally found following overdose of sustained-release medications.[6]
  • Phytobezoars are composed of indigestible plant material (e.g., cellulose), and are frequently reported in patients with impaired digestion and decreased gastric motility.
  • Diospyrobezoar is a type of phytobezoar formed from unripe persimmons.[7] Coca-Cola has been used in the treatment.[8][9][10]
  • Trichobezoar is a bezoar formed from hair[11] – an extreme form of hairball. Humans who frequently consume hair sometimes require these to be removed. The Rapunzel syndrome, a very rare and extreme case, may require surgery.

By location


  • Esophageal bezoars in the nasogastrically fed patients on mechanical ventilation and sedation have been reported to be due to precipitation of certain food types rich in casein, which get precipitated with gastric acid reflux to form esophageal bezoars.
  • Ox bezoars (cow bezoars) are used in Chinese herbology, where they are called niu-huang (牛黃) or calculus bovis. These are gallstones, or substitutes, from ox or cattle gall bladder bile. There are artificial calculus bovis used as substitutes. These are manufactured from cholic acid derived from bovine bile.[12] In some products, they claim to remove "toxins" from the body.


Bezoars had value because they were believed to have the power of a universal antidote against any poison. Tradition held that a drinking glass which contained a bezoar would neutralize any poison poured into it. The word "bezoar" comes from the Persian pād-zahr (پادزهر), which literally means "antidote."[13]

The Andalusian physician Ibn Zuhr (d. 1161), known in the West as Avenzoar, is thought to have made the earliest description of bezoar stones as medicinal items.[14] Extensive reference to bezoars also appears in the Picatrix, which may have originated earlier.

In 1575, French surgeon Ambroise Paré described an experiment to test the properties of the bezoar stone. At the time, the bezoar stone was deemed able to cure the effects of any poison, but Paré believed this was impossible. It happened that a cook at King's court was caught stealing fine silver cutlery and was sentenced to death by hanging. The cook agreed to be poisoned instead. Ambroise Paré then used the bezoar stone to no great avail, as the cook died in agony seven hours after taking poison.[15] Paré had proved that the bezoar stone could not cure all poisons, contrary to popular belief at the time.

Modern examinations of the properties of bezoars by Gustaf Arrhenius and Andrew A. Benson of the Scripps Institution of Oceanography have shown that they could, when immersed in an arsenic-laced solution, remove the poison. The toxic compounds in arsenic are arsenate and arsenite. Each is acted upon differently, but effectively, by bezoar stones. Arsenate is removed by being exchanged for phosphate in the mineral brushite, a crystalline structure found in the stones. Arsenite is found to bond to sulfur compounds in the protein of degraded hair, which is a key component in bezoars.[16]

A famous case in the common law of England (Chandelor v Lopus, 79 Eng Rep. 3, Cro. Jac. 4, Eng. Ct. Exch. 1603) announced the rule of caveat emptor ("let the buyer beware") if the goods they purchased are not in fact genuine and effective. The case concerned a purchaser who sued for the return of the purchase price of an allegedly fraudulent bezoar. (The law report does not discuss how the plaintiff discovered that the bezoar did not work.)

Bezoars were important objects in cabinets of curiosity and natural history collections, especially for their use in early modern pharmacy and the study of animal health.[17][18]

The Merck Manual of Diagnosis and Therapy notes that consumption of unripened persimmons has been identified as causing epidemics of intestinal bezoars, and that up to 90% of bezoars that occur from eating too much of the fruit require surgery for removal.[19]

A 2013 review of three databases identified 24 publications presenting 46 patients treated with Coca-Cola for phytobezoars. The cola was administered in doses of 500 mL to up to 3000 mL over 24 hours, orally or by gastric lavage. A total of 91.3% of patients had complete resolution after treatment with Coca-Cola: 50% after a single treatment, others requiring the cola plus endoscopic removal. Doctors resorted to surgical removal in four cases.[20]

See also



  1. (1603) 79 ER 3
  2. "bezoar" at Dorland's Medical Dictionary
  3. Bala M, Appelbaum L, Almogy G (November 2008). "Unexpected cause of large bowel obstruction: colonic bezoar". Isr. Med. Assoc. J. 10 (11): 829–30. PMID 19070299.
  4. Pitiakoudis M, Tsaroucha A, Mimidis K, et al. (June 2003). "Esophageal and small bowel obstruction by occupational bezoar: report of a case". BMC Gastroenterol. 3 (1): 13. doi:10.1186/1471-230X-3-13. PMC 165420. PMID 12795814.
  5. Mintchev MP, Deneva MG, Aminkov BI, Fattouche M, Yadid-Pecht O, Bray RC (1 February 2010). "Pilot study of temporary controllable gastric pseudobezoars for dynamic non-invasive gastric volume reduction". Physiol. Meas. 31 (2): 131–44. Bibcode:2010PhyM...31..131M. doi:10.1088/0967-3334/31/2/001. PMID 20009188.
  6. Buckley NA, Dawson AH, Reith DA (January 1995). "Controlled release drugs in overdose. Clinical considerations". Drug Safety. 12 (1): 73–84. doi:10.2165/00002018-199512010-00006. PMID 7741985.
  7. Kishan, Asn; Kadli, NK (2001). "Bezoars". Bombay Hospital Journal. Archived from the original on 2008-08-28. Retrieved 2008-10-31.
  8. Chung YW, Han DS, Park YK, et al. (July 2006). "Huge gastric diospyrobezoars successfully treated by oral intake and endoscopic injection of Coca-Cola". Dig Liver Dis. 38 (7): 515–7. doi:10.1016/j.dld.2005.10.024. PMID 16330268.
  9. Ha SS, Lee HS, Jung MK, et al. (December 2007). "Acute Intestinal Obstruction Caused by a Persimmon Phytobezoar after Dissolution Therapy with Coca-Cola". Korean Journal of Internal Medicine. 22 (4): 300–3. doi:10.3904/kjim.2007.22.4.300. PMC 2687663. PMID 18309693. Archived from the original on 2011-07-22. Retrieved 2008-12-19.
  10. Hayashi, Kazuki; Ohara, Hirotaka; Naitoh, Itaru; Okumura, Fumihiro; Andoh, Tomoaki; Itoh, Takafumi; Nakazawa, Takahiro; Joh, Takashi (November 12, 2008). "Persimmon bezoar successfully treated by oral intake of Coca-Cola: a case report". Cases Journal. London, England, U.K.: BioMed Central (published December 11, 2008). 1 (1): 385. doi:10.1186/1757-1626-1-385. ISSN 1757-1626. OCLC 234326274. PMC 2627813. PMID 19077219. Referring to past reports [1-9], the period from the administration of Coca-Cola until the disappearance of the bezoars was a minimum of 1 day and a maximum of 2 months.
  11. Malhotra A, Jones L, Drugas G (November 2008). "Simultaneous gastric and small intestinal trichobezoars". Pediatr Emerg Care. 24 (11): 774–6. doi:10.1097/PEC.0b013e31818c2891. PMID 19018222.
  12. Ingredients, AN KUNG NIU HUANG WAN (Bezoar Chest Functioning Pills), Peking Tung Jen Tang, Peking, China. 1980.
  14. Byrne, Joseph P. (2012-01-31). Encyclopedia of the Black Death. ABC-CLIO. p. 33. ISBN 978-1598842531.
  15. Stephen Paget (1897). Ambroise Paré and His Times, 1510–1590. G.P. Putnam's Sons. pp. 186–187.
  16. "Archived copy". Archived from the original on 2013-01-16. Retrieved 2012-11-30.CS1 maint: archived copy as title (link) [dead link]
  17. Heintzman, Kit (2018). "A cabinet of the ordinary: domesticating veterinary education, 1766–1799". The British Journal for the History of Science. 51 (2): 239–260. doi:10.1017/S0007087418000274. PMID 29665887.
  18. Peter Borschberg; Michael North (ed.) (2010). The Euro-Asian trade in bezoar stones (approx. 1500 to 1700). Burlington: Ashgate.CS1 maint: extra text: authors list (link)
  19. Merck Manual, Rahway, New Jersey, Sixteenth Edition, Gastrointestinal Disorders, Section 52, p. 780
  20. Ladas SD, Kamberoglou D, Karamanolis G, Vlachogiannakos J, Zouboulis-Vafiadis I (2013). "Systematic review: Coca-Cola can effectively dissolve gastric phytobezoars as a first-line treatment". Aliment Pharmacol Ther. 37 (2): 169–173. doi:10.1111/apt.12141. PMID 23252775.


Further reading

  • Borschberg, Peter, "The Euro-Asian Trade in Bezoar Stones (approx. 1500–1700)", Artistic and Cultural Exchanges between Europe and Asia, 1400–1900: Rethinking Markets, Workshops and Collections, ed. Thomas DaCosta Kaufmann and Michael North, Aldershot: Ashgate, 2010, pp. 29–43.
  • Borschberg, Peter, "The Trade, Forgery and Medicinal Use of Porcupine Bezoars in the Early Modern Period (c.1500–1750)", ed. Carla Alferes Pinto, Oriente, vol. 14, Lisbon: Fundação Oriente, 2006.
External resources

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.