There are several reasons for the old gas in the stomach: 1, bacteria in the gastrointestinal produce a lot of gas, gastrointestinal diseases such as gastritis, enteritis, duodenal ulcer, gastric ulcer, etc. will destroy the body’s defense system, many bacteria will invade the gastrointestinal, the food in the gastrointestinal is decomposed by bacteria, fermentation will produce a lot of gas, so that the old gas in the stomach situation. 2, poor dietary habits, usually like to eat easy to produce gas The food, such as beans, potatoes, radish, etc., these foods will produce a lot of gas in the stomach and intestines. In addition, like to eat fruits with high fructose content such as apples, pears, mangoes, etc. The fructose in these foods is difficult to digest and will produce a lot of gas after being decomposed by bacteria and fermented, so there will be a situation of old gas in the stomach. 3, lack of exercise, long-term lack of exercise gastrointestinal function will become worse, the speed of gastrointestinal peristalsis will become slower, the gas in the intestines is difficult to discharge from the body, there will be a situation of old gas in the stomach. 4, long-term stress, long-term stress will affect the gastrointestinal health, digestive capacity will be reduced, resulting in the gastrointestinal gas is not easy to discharge from the body, resulting in gas in the stomach. In addition, when stressed, people’s breathing will become heavy, inhaling more gas, will also lead to old gas in the stomach.