The color and shape of stool can reflect a person’s health condition, among which dark stool, dry stool, and thin stool are all reflections of disease. Many patients are not concerned about black stools because diet can also cause black stools, such as eating pig’s blood. Black stools are usually accompanied by other symptoms, and it is not scientific to judge a disease based on black stools alone. Black stool usually occurs when there is bleeding in the upper gastrointestinal tract. The upper gastrointestinal tract includes the mouth, pharynx, esophagus, stomach and duodenum. Esophagitis, esophageal malignancy, esophageal ulcers, acute gastritis, chronic gastritis, gastric ulcers, gastric malignancy, duodenal ulcers, diverticulitis, and certain medications (such as cortisone, aspirin, and noisomycin) can cause upper gastrointestinal bleeding. When the amount of bleeding in the upper gastrointestinal tract exceeds 50 ml, black stools appear. Of course, in the lower gastrointestinal tract, such as the right hemicolectomy bleeding, if it stays in the intestine for a longer time due to constipation, etc., black stools can also appear. A, what is the cause of black stool 1, systemic infectious diseases systemic diseases is the direct cause of constipation stool black, the so-called diseases here mainly include: such as sepsis, typhoid, etc., newborns swallowed into the mother’s birth canal blood or nipple rupture of blood, nose, throat, gum bleeding swallowed, etc. can be stool black. 2, blood disease Investigation shows: blood disease is also caused by black stool herbal causes, such as: neonatal hemorrhage, hemophilia, leukemia, aplastic anemia, thrombocytopenia and allergic purpura, etc. may cause black stool. 3, food Certain things may also trigger the i situation of black stool, in ordinary life, we are sometimes easily confused with blood in the stool. Such as eating animal blood, or a large amount of beef, pig liver, the iron in which can be formed in the human intestine black iron sulfide, so that the color of the stool becomes black; other such as eating a lot of prune jam, mulberry jam, are likely to make the color of the stool becomes black. 4, digestive tract diseases digestive tract diseases are important factors that cause constipation stool black, mainly including cirrhosis combined with esophageal or gastric fundic varices rupture, esophageal foreign body, ulcer disease, acute gastritis, gastric mucosal prolapse, intestinal sleeve, hemorrhagic necrotizing small bowel inflammation, strangulated intestinal obstruction, Meckel’s diverticulum, intestinal polyps, anal fissure, gastric cancer, etc. can cause black stool, tarry color. Of course, the black stools seen clinically are not all caused by upper gastrointestinal bleeding. Taking certain medications for gastric diseases, such as Lodex, Lizudra, or eating animal blood, such as tofu stew with pig’s blood, which is commonly eaten, can also cause the stools to turn black. Clinical attention should be paid to differentiate from the upper gastrointestinal bleeding caused by black stools to avoid mistakes. Second, other causes of black stool 1, drugs caused by black stool oral activated charcoal end, blood iron, treatment of stomach disease bismuth agent and some Chinese medicine, can also cause black stool; 2, systemic infectious diseases caused by black stool such as sepsis, typhoid, etc., newborns swallowed into the mother’s birth canal blood or nipple rupture of blood, nose, throat, gum bleeding swallowed, etc. can be black stool. The cause of black stool may be related to digestive tract diseases, which cause black stools. In order to find out the cause of black stool as soon as possible, patients should pay enough attention to black stool and go to the regular hospital for examination and receive professional standardized treatment in time so as not to miss the time for effective treatment.