Gastric resection for weight loss may have the possibility of complications such as infection, bleeding, gastroesophageal reflux, adhesive intestinal obstruction, dumping syndrome, etc. If recommended by a professional physician, priority should usually be given to choosing a reasonable and healthy way to lose weight. 1. Infection: During the recovery period of gastric resection surgery, patients may suffer from various reasons that may trigger infection of the incision or develop infection of the gastric anastomosis, resulting in bacteria or other gastric contents entering the abdominal cavity, resulting in abdominal pain and other symptoms; 2, bleeding: patients with severe nausea, vomiting and other symptoms pulling the anastomosis or other reasons may trigger the phenomenon of postoperative bleeding from the gastric or abdominal wall anastomosis, which may have black stools, vomiting blood and other symptoms; 3, gastroesophageal reflux: due to the reduction of residual gastric volume caused by surgery, patients are prone to indigestion and increased pressure in the stomach, which can lead to gastroesophageal reflux. In addition, the lower esophageal sphincter may be damaged during surgery, resulting in reduced function, which can also cause gastroesophageal reflux symptoms; 4. Adhesive intestinal obstruction: gastrointestinal surgery is prone to local tissue adhesions, which can cause adhesive intestinal obstruction, which can manifest as abdominal distension, nausea, anal stoppage of exhaustion and defecation, and even dehydration and shock in severe cases; 5. Dumping syndrome: patients who have undergone surgery may appear dumping syndrome, which may manifest as palpitations, sweating, nausea, vomiting, and fainting after eating. After resting, the patient can be gradually relieved, especially after eating sweets will be more likely to have the above reaction; 6. Other: In addition, after the gastrectomy, the patient may also have regained weight, incisional hernia, gastric leakage, etc. Due to malabsorption of nutrients caused by gastrectomy, anemia, osteoporosis, malnutrition, etc. The possibility of gastritis and other diseases occurring in the remnant stomach is higher than that of the normal stomach.