Black stool caused by bleeding in the GI tract usually disappears in about three days after the bleeding in the GI tract stops. If the GI bleeding continues, then the black stool will persist. Black stool is mostly caused by upper gastrointestinal bleeding, and common causes of upper gastrointestinal bleeding include ruptured varices of the esophagogastric varices, esophageal cancer, and gastroduodenal ulcers. Black stool caused by gastrointestinal bleeding will usually disappear in about three days after the bleeding in the gastrointestinal tract stops. If the bleeding in the digestive tract continues, then the black stool will persist. Gastrointestinal bleeding should be examined by the gastroenterology department of the local hospital in time to find the cause of the bleeding before it can be stopped in time. Gastrointestinal bleeding, conventional treatment: proton pump inhibitors such as omeprazole acid gastric protection, hemostasis, rehydration and other treatments, such as drugs, conservative treatment is not effective, the need for timely surgical treatment. If gastrointestinal bleeding, you need to consult a doctor in a timely manner, under the guidance of the doctor’s medication, dynamic monitoring of black stools, blood counts, etc., active treatment, so as not to miss the condition.