Is it possible for lactose intolerance to cause chronic gastritis/duodenitis?

Lactose intolerance: Lactose intolerance occurs due to a deficiency in lactase in the gut cells. Lactase is an enzyme that breaks down lactose sugar. Gas and bloating occur as the lactose is instead broken down by the gut bacteria. It is not a cause of chronic gastritis or duodenitis.

Similar symptoms: Main symptoms include tummy pain, bloating, flatulence, or diarrhea. Can also cause vomiting and audible bowels lactose is a sugar present in milk, and needs a special chemical produced by the small bowels to be digested When this chemical is lacking the lactose pass quickly to the large bowel where it is either converted to fat, fermented or remain unchanged causing the above symptoms

Lactose intolerance : Lactose intolerance is a condition in which the body has difficulty handling lactose. People with this condition may get diarrhoea, stomach pains and bloating if they drink milk or eat dairy products. Some people are born with a tendency to develop lactose intolerance; others get it as a result of gastroenteritis or chemotherapy. The treatment is mainly to avoid lactose.

Unlikely: Lactose intolerance is not known to cause duodenitis or gastritis. There can be cross over between the symptoms people experience from these conditions. Pain in the upper abdomen, fullness after meals, rescued appetite, belching, nausea/vomiting are called 'dyspepsia' and there is a wide range of possible causes. You would be best to see your GP to review this in detail.