The clinical symptoms in lactose intolerance are mostly attributable to passage of most of the dietary lactose in its unaltered form through small intestine into a colon ; in the colon , this unaltered lactose in subjected to rapid metabolization by the colonic bacteria. As a result, individual intolerant of lactose typically experience gastric symptoms, such as abdominal pain and bloating, excessive flatus and diarrhea due to excessive fluid and gas formation in the bowel following ingestion of lactose containing food like milk and milk product.

Lactose Maldigestion in gastro intestinal conditions.