Black stools may be related to food, drugs, gastrointestinal bleeding, food, drug-related black stools generally adjust the diet, stopping medication after the improvement; gastrointestinal bleeding caused by black stools to seek medical attention in a timely manner, fasting water, omeprazole acid suppression, blood loss should be replenished with fluids and blood transfusions, and if necessary, surgical hemostasis. 1. Food, drugs:Eat black rice, black beans, mulberries and other black food, these foods contain natural pigments, resulting in black stools; consume too much animal blood products, blood products in the oxidation of iron ions can cause black stools. Drugs such as ferrous succinate, bismuth potassium citrate and other iron, bismuth, oxidized in the intestinal tract leading to black stools, generally stop using these food medications will improve. 2. Gastrointestinal bleeding: patients with upper gastrointestinal bleeding hemoglobin subferric iron ions oxidized to iron ions under the action of gastric juice, resulting in black stools. Treatment should be fasting water, give omeprazole acid suppression, thrombin lyophilized powder, Yunnan Baiyao hemostasis, bleeding hemodynamic instability should be rehydration and expansion of blood transfusion therapy, endoscopic hemostasis treatment when necessary. The appearance of black stools, we should promptly go to the hospital, identify the causes, follow the doctor’s instructions for treatment, to avoid delaying the condition.