When abdominal surgery is performed, there is a risk of paroxysms of pain due to the impact on the patient’s gastrointestinal function, which can lead to a lot of gas buildup inside the gastrointestinal tract after the surgery. The patient will experience bloating and other phenomena, so the patient’s stomach looks larger. When the function of gastrointestinal tract returns to normal in about three days after the operation, that is to say, gas and defecation are normal, and the patient can eat fluids and semi-fluids, the stomach can be slightly reduced, which is a normal phenomenon. If the patient’s stomach stays very big after the surgery, the anus stops defecation, the pain in the abdomen increases significantly, and there are nausea, vomiting and other symptoms, then there may be intestinal obstruction, gastric retention and other phenomena, and abdominal CT or gastroscopy will be carried out if necessary.