Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.

Definition of Intolerance, lactose

Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026

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, a

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