When the body does not secrete lactase enzyme in the intestine, the lactose sugar is not digested. bacteria that are a normal part of the colon use the lactose for food and produce gas. how does this contribute to the symptoms of lactose intolerance?

Production of Gas by Bacteria causes bloating and abdominal pain, which are symptoms of Lactose intolerance.

Step-by-step Explanation:

Lactose intolerance is a digestive disorder characterised by intolerance towards milk and other dairy products.A person having lactose intolerance  cannot digest lactose present in the milk.These occurs due to the lack of lactase enzyme secretion in the gut.Whenever milk or milk products are consumed and Lactose enters the digestive tract the micro flora of the gut starts feeding upon lactose producing gas.Excessive production of the Gas causes severe bloating and abdominal pain.A pressure on the intestinal wall causes irregular bowel movement i.e. Constipation or Diarrhea.This disorder is quite common within the population.