Duodenal flatulence can be caused by improper diet, indigestion and duodenitis. 1. Improper diet: Irregular diet, consuming too much high-fat food or protein, etc., will easily affect the normal digestion and absorption of food, which will cause the food to ferment in the body, thus producing gas. These gases collect in the body and are not discharged in time, which may lead to duodenal flatulence. 2. Indigestion: When indigestion occurs, gastrointestinal peristalsis slows down, which prevents food from being completely digested and absorbed, and the fermentation of food produces a large amount of gas, which can also cause duodenal flatulence. 3. Duodenitis: the duodenum has a certain exhaust function, when the duodenum inflammation, can make it appear functional disorder, resulting in its exhaust function is affected, which can lead to duodenal flatulence. Duodenal flatulence, need to go to the regular hospital in time for relevant examination and treatment.