Leaky gut, also known clinically as intestinal fistula, is usually a group of clinical symptoms caused by local weakness of the intestinal wall due to medical factors, or autoimmune enteropathy, which causes intestinal contents to enter the free abdominal cavity instead of passing smoothly through the intestinal cavity. Generally, if an intestinal fistula is not drained out of the abdominal cavity, it first causes severe pain because the intestinal contents contain a large amount of digestive juices, including gastric juice, intestinal juice, bile, and pancreatic juice, which can cause chemical peritonitis, and further development can cause bacterial infection, resulting in bacterial peritonitis. After being absorbed by the body, in addition to symptoms of abdominal pain and bloating, it will also cause clinical symptoms of chills, fever, and even toxic shock.