People with lactose intolerance are unable to fully digest the lactose in milk. As a result, they have diarrhea, abdominal cramp, nausea, and bloating after eating or drinking dairy products. The condition, which is also called lactose malabsorption, is usually harmless, but its symptoms can be uncomfortable. Diagnosis may be confirmed if symptoms resolve following eliminating lactose from the diet. So people with lactose intolerance need to be careful about the foods they eat every day.

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