Lactose intolerance is either hereditary or due to factors such as presence of intestinal parasites, chemotherapy, side-effect of penicillin, post-surgery effect, less or no consumption of dairy products, and hormonal changes during pregnancy. The heredity form of lactose intolerance is generally found in people in whom consumption of dairy products is limited, for instance, people in countries of Africa and Asia. The diagnosis of lactose intolerance is done usually after the frequent observation of symptoms.
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