Definition of Intolerance, lactose
Intolerance, lactose: The inability to digest lactose, a component of milk and some other dairy products. The basis for lactose intolerance is the lack of an enzyme called lactase in the small intestine. The most common symptoms of lactose intolerance are diarrhea, bloating, aSource: MedTerms™ Medical Dictionary
Last Editorial Review: 7/1/2016
Get the latest treatment options.