The color of the stool is related to dietary factors and medications, and if accompanied by abdominal pain and other symptoms of abdominal discomfort, it is also important to consider the possibility of organic diseases of the intestinal tract. If there are no symptoms such as abdominal pain or diarrhea after a cesarean section, blackish-green stools may be caused by consuming green leafy vegetables and animal blood or taking medications that contain iron. Generally, the color of stool will return to normal after changing the diet or stopping the medication. If accompanied by abdominal pain, it is necessary to consider the possibility of gastrointestinal bleeding due to enteritis and other intestinal diseases, and it is necessary to further clarify whether there is the possibility of gastrointestinal bleeding through the fecal routine plus occult blood test.