Gastric diversion surgery is generally harmless, there may be complications such as malnutrition or anastomotic ulcers, which can be relieved and treated by dietary modification or medication. 1. Malnutrition: Malnutrition is a sequela of gastric diversion surgery. Gastric diversion surgery will reduce the capacity of the stomach, resulting in malnutrition, anemia, weight loss and other symptoms. You can choose dietary modification such as kiwi, cabbage, red beans and other foods to improve. 2. Anastomotic ulcers: Gastric flow surgery will easily lead to gastric acid secretion disorder, which will lead to anastomotic ulcers. Generally, you can use drugs such as rabeprazole sodium enteric-coated tablets, pantoprazole sodium enteric-coated tablets or esomeprazole magnesium enteric-coated tablets to inhibit the production of gastric acid under the guidance of the doctor. Gastric diversion surgery is generally not harmful, such as the emergence of discomfort timely medical treatment, under the guidance of the doctor with medication.