The inability to digest lactose, a form of sugar found in milk and milk products. It is a fairly common ailment that is caused in large part by genetic predispositions. As a result, disaccharides cannot be absorbed through the wall of the small intestine and into the bloodstream, leaving lactose to pass intact into the colon. When lactose is ingested symptoms can include bloating, pain or cramps in the lower belly, gas, diarrhea, and vomiting. Lactose intolerance can be determined by a simple stool acidity test, which is good option for infants because of its minimally invasive nature. A hydrogen breath test can also determine if lactose cannot be properly digested.
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