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Lactose intolerance
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Lactose intolerance

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Contributors: Michael W. Winter MD, Christine Osborne MD, Khaled Bittar MD, Nishant H. Patel MD, Desiree Rivera-Nieves MD, Paritosh Prasad MD
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Synopsis

Lactose intolerance is a common malabsorption disease caused by insufficient lactase enzyme in the small intestine resulting in flatulence, diarrhea, bloating, and cramping abdominal pain after ingesting lactose-containing foods. The incidence of lactose intolerance varies among ethnicities, with patients of African, Asian, Native American, and Hispanic descent most affected.

Lactase deficiency can be primary, secondary, or congenital.
  • Primary – Low levels of lactase enzyme. Symptom onset may be in childhood or adulthood.
  • Secondary – Reversible lactase deficiency caused by mucosal injury, often in the setting of viral illnesses.
  • Congenital – A rare autosomal recessive absence of lactase activity at birth leading to diarrhea and hypercalcemia in infancy, predisposing patients to nephrocalcinosis.
For more information on adult lactose intolerance, see OMIM.

For more information on congenital lactase deficiency, see OMIM.

Codes

ICD10CM:
E73.9 – Lactose intolerance, unspecified

SNOMEDCT:
267425008 – Lactose Intolerance

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Last Reviewed: 01/11/2018
Last Updated: 01/30/2018
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Lactose intolerance
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Lactose intolerance : Abdominal pain, Diarrhea, Nausea, Vomiting, Abdominal cramp, Developed rapidly , Hyperactive bowel sounds, No acute distress
Copyright © 2019 VisualDx®. All rights reserved.