Early complications of radical gastric cancer surgery mainly include bleeding, organ damage, fistula, etc. Late complications are as follows: 1. With the healing of incision, there may be distant complications, common dumping syndrome, where things are eaten and discharged faster, mainly because the function of gastrointestinal tract is accelerated by the movement affected by surgery; 2. Bile and alkaline intestinal fluid reflux, which can reflux into the stomach and also into the esophagus; 3. Some patients may suffer from Malnutrition, the stomach has an important role in the process of digestion and absorption, once the stomach is completely or partially removed, it will affect the digestive function; 3. The risk of stomach cancer is 6-7 times higher than that of the general population for the part of the residual stomach left behind. Therefore, after radical gastric cancer surgery, if part of the stomach is left behind, regular checkups must be conducted to prevent the occurrence of new gastric cancer.