Bloating on a full stomach is caused by diseases such as gastric insufficiency, pyloric obstruction, and stomach cancer. After food enters the stomach, the stomach will digest the food through peristalsis and expel it into the intestines. Once gastric insufficiency occurs, the digestion of food will be affected, and the time of food emptying will be prolonged. As the food remains in the stomach for a long time, it will ferment, which not only increases the volume, but also produces a lot of gas, which leads to a feeling of bloating and pain in the stomach. After digestion, food needs to pass through the pylorus to be discharged into the duodenum, and once the pylorus is obstructed, the discharge of food will be affected, and then the feeling of bloating and pain will occur. Gastric cancer is a kind of malignant tumor disease, early symptoms are not particularly obvious, and it has many similarities with gastritis and gastric ulcer. However, when it enters the advanced stage, it will affect the stomach function, and many patients will not only have loss of appetite, but also have bloating and pain in the stomach at the same time.