If a patient is recovering from gastric cancer surgery, it is a normal phenomenon to have diarrhea when defecating, which is about three times a day. Because the function of gastrointestinal tract has not been completely restored to normal at the beginning, the patient may have diarrhea and the number of stools per time is relatively small, so it is usually possible to continue to observe for a period of time. If the diarrhea occurs after the patient resumes eating, for example, after drinking fish soup or pork ribs soup, it may be caused by too much fat in the food, because the patient’s gastrointestinal tract has not completely returned to normal at this time, and eating greasy food may be malabsorption, so it is necessary to reduce the intake of soup food, and if necessary, you can eat rice soup or thin rice and other foods without fat. If the patient has a lot of diarrhea, it is necessary to consider the use of anti-diarrheal drugs for symptomatic treatment, such as oral montelukast, etc.