If it is caused by taking drugs, blood products, etc., no special treatment is needed. If it is gastric ulcer and other gastrointestinal bleeding, you need to actively carry out hemostatic treatment, can use growth inhibitors to reduce local blood flow, proton pump inhibitors (such as omeprazole) to reduce gastric acid on the gastric mucosa stimulation. 1. If you take iron and other drugs, or eat duck blood, pig blood and other blood products, in the gastrointestinal tract under the action of the digestive juices under the chemical reaction, there will be a black stool color, if the stool is softer will be manifested as a sticky, black black. This is a normal phenomenon, usually no other symptoms, reduce the consumption of such food or drugs, usually can be eliminated, without special treatment. 2. If gastric ulcer, gastric cancer and other causes of gastrointestinal bleeding, there may also be black sticky stools, usually black in color. Gastroscopy can be done to make a clear diagnosis, and endoscopic hemostasis is also feasible. Growth inhibitors etc. can also be used to reduce local blood flow and avoid increased bleeding. Proton pump inhibitors (omeprazole) can also be used to inhibit the secretion of gastric acid and reduce the damage of gastric acid to the gastric mucosa. When this phenomenon occurs, physiological reasons such as feeding should be ruled out, and timely consultation should be made to identify the cause under the guidance of the doctor and reasonable treatment should be carried out so as not to delay the treatment.