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Lactose intolerance is the inability to digest lactose.

Lactose intolerance is the inability to digest lactose.
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Lactose intolerance symptoms

The symptoms of lactose intolerance include:

The symptoms usually come on 30 minutes to 2 hours after eating or drinking products that contain lactose.

Lactose intolerance occurs when the body does not produce enough lactase enzyme to break down the lactose in the gut and so the lactose is not absorbed.

The unabsorbed lactose moves on to the large intestine where it’s digested by bacteria using their own enzymes. The gases created in this process can produce the symptoms of lactose intolerance, including bloating and abdominal cramps.

Last reviewed: November 2016

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