Eating and vomiting after appendicitis surgery may be caused by anesthesia reaction, complication of intestinal obstruction and postoperative water and electrolyte disorders. 1. Anesthesia reaction: after the surgery, the anesthetics used in the surgery will affect the gastrointestinal function of the human body because the effect of anesthetics has not completely disappeared, which will slow down the digestive and absorptive function of the gastrointestinal tract and cause the reaction of vomiting after appendicitis surgery. 2. Complicated intestinal obstruction: after appendicitis surgery, it is easy to cause patients to develop intestinal adhesions, which will lead to adhesive intestinal obstruction, and patients will have abdominal pain, abdominal distension, nausea and vomiting, which will lead to the reaction of wanting to vomit after appendicitis surgery. 3. Postoperative water and electrolyte disorders: water, electrolyte and acid-base balance disorders are easy to occur after surgery, such as postoperative complications of hypokalemia, hyponatremia, followed by nausea and vomiting, and thus the reaction of eating and vomiting after appendicitis surgery. If the patient wants to vomit after appendicitis surgery, it is recommended to inform the doctor in time, after a clear examination, and actively cooperate with the doctor for treatment.