Not drinking water but vomiting 100 ml of black water in the stomach may be related to food, drugs, upper gastrointestinal bleeding, etc. It can be relieved by stopping food, drugs, use of drugs such as octreotide, endoscopic treatment, surgical treatment, and so on. 1. Food, drugs: for example, consumption of iron, animal offal, blood products, etc., may lead to nausea, vomiting and black vomit, usually the symptoms can gradually improve after stopping consumption. 2. Upper gastrointestinal bleeding. (1) If the bleeding is caused by varicose veins in the esophagus and fundus of the stomach, it can be treated with intravenous growth inhibitors, octreotide and other medications, and the use of triple-lumen tubes to compress the fundus of the stomach and esophagus to stop bleeding. Stabilized patients can also use endoscopic hemostasis, such as endoscopic injection of sclerosing agent, lancing and so on. If the bleeding still can not be stopped should be timely surgical treatment. (2) If the bleeding is caused by peptic ulcer, gastric cancer, etc., drugs such as lansoprazole, omeprazole, etc. can be used, and endoscopic hemostasis, such as sclerosing agent injection, titanium clip hemostasis, thermal coagulation hemostasis, etc., and surgical hemostasis should be performed if necessary. The above drugs are prohibited for those who are allergic to them, and all of them should be taken in accordance with medical advice. If the patient appears to vomit black water, it is recommended to go to the regular hospital in time, after clarifying the cause of the disease, targeted treatment under the guidance of the doctor, in order to reduce the adverse effects of the disease.