Many patients are told by their doctors and nurses the night before surgery that they cannot eat or drink after 10:00 p.m. tonight. A lot of patients will feel very puzzled, what does surgery have to do with eating? That person may say: I know, because after the operation, you have to stay in bed for a long time, and it is inconvenient for you to urinate and defecate, so you are not allowed to eat before the operation, and you have to take an enema to empty your gastrointestinal tract. Is this the truth? The answer is no. In fact, the prohibition of eating and drinking for a period of time before surgery is more important from the perspective of patient safety during surgery. Patients enter the operating room, if you receive general anesthesia, will fall asleep within half a minute after the use of general anesthesia drugs, if the patient’s stomach has a lot of food, there may be a medical emergency called “gastric reflux aspiration”. One of the reflux refers to the contents of the stomach out of the esophagus into the oropharynx, and aspiration is the most terrible, refers to the reflux of the contents of the stomach into the trachea and lungs. This certainly doesn’t happen in an awake person because the body has a protective choking reflex that clears this stuff out. However, in anesthetized patients, this protective reflex is lost because of the effects of the anesthetic drugs, and if it ever happens, the consequences can even be fatal. This is the reason why anesthesiologists are particularly interested in whether or not eating and drinking are prohibited before surgery. And there is a situation also most anesthesiologists headache, that is drunken fight or car accident caused by trauma, emergency surgery patients, this patient itself in the full stomach state, and because of drunkenness, consciousness is not clear, it is very easy to gastric reflux aspiration. Knowing this, if the person next to you wants to sneak something to eat or drink before undergoing surgery, you can be sure to tell him this to avoid accidents.