There are many reasons for excessive exhaust, including functional dyspepsia, improper diet, suffering from other gastrointestinal digestive diseases, not necessarily cancer, as follows: 1. Functional dyspepsia: the digestive function of the spleen and stomach is reduced, and the food eaten can not be digested and absorbed in a timely manner, and the food in the body a large number of stagnation, excessive fermentation will produce a large amount of gas, resulting in increased exhaust. 2. Improper diet: eating too much easy to Gas-producing food, easy to gas-producing foods are potatoes, sweet potatoes, onions, cabbage, broccoli, carbonated beverages, dairy products and soy products, etc. 3, suffering from other gastrointestinal digestive diseases: such as gastritis, gastric ulcer, duodenal ulcer, etc., gastrointestinal dysfunction will often appear in the abdominal distension, increased exhaust symptoms, especially after meals. 4, gastrointestinal cancers: increase in exhaust and bad smell and taste, usually accompanied by body lethargy. flavor, usually accompanied by body wasting, limb weakness, fever and other symptoms.