Diseases & Conditions


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Lactose Intolerance


Synonyms of Lactose Intolerance
  • Alactasia
  • Disaccharidase Deficiency
  • Glucose-Galactose Malabsorption
  • Hypolactasia
  • Lactase Deficiency
  • Lactase Isolated Intolerance

Disorder Subdivisions

  • Congenital Lactose Intolerance
  • Lactose Intolerance of Adulthood
  • Lactose Intolerance of Childhood
  • Neonatal Lactose Intolerance


General Discussion
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).
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Organizations related to Lactose Intolerance
  • MUMS (Mothers United for Moral Support, Inc) National Parent-to-Parent Network
    150 Custer Court
    Green Bay WI 54301-1243
    Phone #: 920-336-5333
    800 #: 877-336-5333
    e-mail: mums@netnet.net
    Home page: http://www.netnet.net/mums/
  • March of Dimes Birth Defects Foundation
    1275 Mamaroneck Avenue
    White Plains NY 10605
    Phone #: 914-428-7100
    800 #: 888-663-4637
    e-mail: Askus@marchofdimes.com
    Home page: http://www.marchofdimes.com
  • NIH/National Institute of Diabetes, Digestive & Kidney Diseases
    Endocrine Diseases Metabolic Diseases Branch
    Bethesda MD 20892-3570
    Phone #: 301-654-3810
    800 #: --
    e-mail: NDDIC@info.niddk.nih.gov
    Home page: http://www.niddk.nih.gov



For a Complete Report

This is an abstract of a report from the National Organization for Rare Disorders, Inc. ? (NORD). A copy of the complete report can be obtained for a small fee by visiting the NORD website. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational treatments (if available), and references from medical literature. For a full-text version of this topic, see http://www.rarediseases.org/search/rdblist.html