Very loose stools after gastric perforation surgery may be caused by postoperative weakness and gastrointestinal digestive dysfunction. 1. Post-operative weakness: due to the decline in immunity after surgery, the body may have symptoms such as infection, resulting in poor digestion of the gastrointestinal tract, and the appearance of very thin stools. 2. Gastrointestinal digestive dysfunction: after gastric perforation, the stomach contents also have an irritating effect on the intestinal tract, which may also produce stress ulcers and lead to very loose stools. So you should improve your exercise and immunity. Or apply some drugs for treating diarrhea under the guidance of physician, such as montelukast. It is recommended that if the stool is very thin for a long time after the gastric perforation surgery, you should go to the relevant professional hospital department for radical treatment. Usually pay attention to diet, eat less spicy and stimulating food, pay attention to rest.