The black color of stool is mostly seen in dietary factors, drug factors, gastrointestinal bleeding, gastrointestinal tumors, etc. It is mainly targeted to take general treatment, drug treatment, surgical treatment, etc., of which the commonly used drugs are omeprazole, thioglycollate and so on. 1. Dietary factors: may be eaten iron-containing food, such as spinach, animal blood products, generally after stopping the consumption of animal blood products and iron-containing food, it will gradually return to normal, do not need special treatment. 2. Drug factors: taking iron containing drugs and bismuth, such as ferrous sulfate, ferrous succinate, bismuth potassium citrate, etc. Generally, after stopping taking the drugs, it will gradually return to normal and does not need special treatment. 3. Gastrointestinal bleeding: erosive gastritis, gastric ulcer, rupture of esophagogastric fundus varices and other diseases can lead to gastrointestinal bleeding, which can cause black stools. Generally, it is necessary to take acid-suppressing medicines and medicines to protect the gastric mucosa, for example, omeprazole, rabeprazole, aluminum thiogluconate, bismuth pectin, etc., and the bleeding can be stopped after the gastric mucosa is repaired. 3. Digestive tract tumors: including benign tumors and malignant tumors, mainly because of the bleeding caused by the breakage of the surface of the tumor, resulting in black stools, need to take timely surgical treatment, and if it is a malignant tumor, after the surgery, generally also need to do further radiotherapy. There are many reasons for the black color of stool, if you exclude dietary or medication factors, you should go to the hospital in time, cooperate with the doctor to improve the relevant examination, clear diagnosis and then treatment.