The vomiting after gastrectomy is mostly considered to be caused by insufficient gastric power, anesthetic stimulation, anastomotic obstruction, input collaterals obstruction, gastroesophageal reflux and other reasons. 1. Insufficient gastric power: after gastrectomy, some nerves of the stomach are also removed, which causes insufficient peristaltic force of stomach muscle contraction, and it is easy to vomit after the operation. 2. Stimulation of anesthesia: due to the need for anesthesia during gastrectomy, some anesthetic components may remain in the body after the operation, resulting in a certain amount of stimulation of anesthesia to the stomach and intestines, resulting in the desire to vomit. 3. Anastomotic obstruction: after gastrectomy surgery, there are complications, resulting in anastomotic obstruction, increased gastrointestinal pressure, pylorus edema, which leads to vomiting after surgery. 4. Obstruction of input collaterals: after gastrectomy, the obstruction of pancreatic fluid and bile outflow in the input collaterals leads to acute dilatation caused by excessive fluid accumulation, which makes it easy for vomiting to occur. 5. Gastroesophageal reflux: after gastrectomy surgery, the volume of stomach is reduced and stomach acid is high, which triggers gastroesophageal reflux and makes you feel like vomiting. If the above symptoms recur, it is recommended to consult a doctor in time. After the operation, you should pay attention to the observation and report to the doctor in time for disposal.