Dark stools may be related to eating or taking medication, which can be treated without special treatment. Upper gastrointestinal bleeding can be treated with medication; if it is caused by ruptured varices of the fundus of the stomach or massive bleeding in the gastrointestinal tract due to ulcerative disease and other etiological factors, it should be fasted with food and water, and it is not suitable for oral medication, so it can be treated with intravenous medication, or endoscopic and surgical hemostasis. 1. Eating or taking medication: if the patient consumes food with high iron content such as spinach and animal blood products, or takes iron or bismuth medication, it will cause the stool to turn black, which can be restored to normal after stopping the related diet and medication, and no medication is needed. 2. Gastrointestinal bleeding: most of the black stools are considered to be upper gastrointestinal bleeding, such as gastric and duodenal ulcer bleeding, generally can be prescribed by the use of acid-suppressing drugs such as omeprazole, gastric mucosal protective agents such as aluminum sulfate and other treatments; if for the esophagogastric fundal varicose vein rupture bleeding, the use of intravenous administration of post-pituitary hormone, growth inhibitors, etc. for hemostasis, or endoscopy and surgical hemostasis. There are many other causes of black stools, excluding eating or medication factors, it is recommended to go to the hospital in a timely manner, after the cause of the disease is clear, under the guidance of the doctor for targeted treatment, in order to reduce the adverse effects of the disease.