The main reasons for not drinking and eating within a short period of time after surgery are as follows: First, the anesthetic is not completely metabolized after general anesthesia surgery, drinking or eating may cause the patient to choke and cough, or even aspiration may occur, causing pneumonia, resulting in serious complications. Second, after abdominal surgery, the effect of anesthetic may cause paralysis of gastrointestinal function and temporary loss of peristaltic function, which may cause abdominal pain and bloating when patients eat or drink. If a patient undergoes repair surgery for gastrointestinal perforation, eating and drinking too early may cause the patient’s perforation to open again, which is not conducive to the patient’s recovery. Therefore, it is safer for patients to drink and eat after the anesthetic is completely metabolized and the gastrointestinal function is restored after the surgery.