There are the following situations: 1, too much stomach acid, resulting in the stomach and intestines are prone to produce a lot of carbon dioxide gas, resulting in flatulence and old exhaust, as well as acid reflux, hiccups, etc. 2, constipation, resulting in a large number of fecal matter piled up in the intestines, fecal matter by the bacterial decomposition of intestinal fermentation will produce a lot of gas, resulting in flatulence and old exhaust, constipation is relieved, and the above symptoms will also be subsequently 3, physical weakness, too little exercise, resulting in decreased gastrointestinal motility, indigestion will lead to food can not be well digested, absorbed, a large amount of food accumulates in the intestines and stomach, and then be decomposed, fermentation will produce a lot of gas, resulting in flatulence and old exhaust. 4, gastrointestinal diseases, such as gastritis, gastric ulcers, enteritis, duodenal ulcers, etc., leading to gastrointestinal digestive ability decreased, eat in the food can not be well digested, the food can not be well digested, and then eat a lot of gas, resulting in flatulence. The food can not be well digested, absorbed, retained in the stomach and intestines will be decomposed, fermentation produces a lot of gas, resulting in flatulence and old exhaust.