Such injury could be the result of infection, celiac disease, inflammatory bowel disease, or other diseases. Secondary lactose intolerance is due to injury to the small intestine. Primary lactose intolerance occurs as the amount of lactase declines as people grow up. There are four types: primary, secondary, developmental, and congenital. Lactose intolerance is due to the lack of the enzyme lactase in the small intestines to break lactose down into glucose and galactose. Lactose intolerance does not cause damage to the gastrointestinal tract. These symptoms typically start thirty minutes to two hours after eating or drinking something containing lactose, with the severity typically depending on the amount consumed. Symptoms may include abdominal pain, bloating, diarrhea, flatulence, and nausea. Humans vary in the amount of lactose they can tolerate before symptoms develop. Lactose intolerance is caused by a lessened ability or inability to digest lactose, a sugar found in dairy products. ~65% of people worldwide (less common in Europeans and East Africans) Irritable bowel syndrome, celiac disease, inflammatory bowel disease, milk allergy ĭecreasing lactose in the diet, lactase supplements, treat the underlying cause Non-increased ability to digest lactose (genetic, small intestine injury) Lactase deficiency, hypolactasia, alactasiaĪbdominal pain, bloating, diarrhea, flatulence, nausea ĭoes not cause damage to the GI tract ģ0–120 min after consuming dairy products
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