Lactose intoleranceLactase deficiency; Milk intolerance; Disaccharidase deficiency; Dairy product intolerance; Diarrhea - lactose intolerance; Bloating - lactose intolerance
Lactose is a type of sugar found in milk and other dairy products. An enzyme called lactase is needed by the body to digest lactose.
Lactose intolerance develops when the small intestine does not make enough of this enzyme.
Hogenauer C, Hammer HF. Maldigestion and malabsorption. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 10th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 104.
Semrad CE. Approach to the patient with diarrhea and malabsorption. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 25th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 140.
The National Digestive Diseases Information Clearinghouse (NDDIC) website. Lactose intolerance. www.niddk.nih.gov/health-information/digestive-diseases/lactose-intolerance/definition-facts. Updated February 2018. Accessed July 2, 2018.