Lactose intolerance happens when you have a shortage of lactase. If you don't have enough lactase, lactose can't be digested and absorbed from your bowel properly, causing the symptoms of lactose intolerance.

Attribution: BUPA

See also:

• Lactose
• Lactose intolerance - risk groups
• Distribution of lactose intolerance
• Symptoms of lactose intolerance
• Cause of lactose intolerance
• Lactose intolerance - sources of calcium