National Organization for Rare Disorders, Inc.
It is possible that the main title of the report Lactose Intolerance is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
- Disaccharidase Deficiency
- Glucose-Galactose Malabsorption
- Lactase Deficiency
- Lactase Isolated Intolerance
- Congenital Lactose Intolerance
- Neonatal Lactose Intolerance
- Lactose Intolerance of Childhood
- Lactose Intolerance of Adulthood
Lactose is the predominant sugar found in milk and milk products. People with Lactose intolerance (LI) cannot properly digest lactose because they lack or are deficient in the enzyme, lactase, which is key to the digestion of lactose. Lactose is a complex sugar made up of two different sugar molecules (disaccharide), galactose and glucose, each of which is a simple (monosaccharide) sugar and more readily absorbed in the body's stomach and intestine and processed in other organs.
LI is common among adults in the United States and elsewhere. It is worrisome and uncomfortable but not at all dangerous.
This disorder is an inborn error of carbohydrate metabolism characterized by the impaired ability to absorb nutrients from the small intestine (malabsorption syndrome).
March of Dimes Birth Defects Foundation
1275 Mamaroneck Avenue
White Plains, NY 10605
NIH/National Institute of Diabetes, Digestive & Kidney Diseases
Endocrine Diseases Metabolic Diseases Branch
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Bethesda, MD 20892-3570
MUMS National Parent-to-Parent Network
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Green Bay, WI 54301-1243
Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126
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