Spitting up blood after butanetriol injection is considered to be a possible side effect of the drug, or a disease such as peptic ulcer, varicose veins in the fundus of the stomach, or a tumor in the stomach. You should stop using butanetriol immediately, and you can choose acid-suppressing and hemostatic drugs, sleeve surgery and other treatments. 1. Side effects: Among the side effects of this drug are gastric ulcers and gastric bleeding. At this time, the drug should be immediately discontinued, if the bleeding is small, you can choose oral or intravenous application of proton pump inhibitors, if necessary, you can add growth inhibitors to constrict blood vessels to control bleeding. If the amount of bleeding is large, early surgical intervention should be carried out. 2. Peptic ulcer: such as gastric ulcer and duodenal ulcer, can also cause vomiting of blood, usually in small amount, can be applied to inhibit acid gastric drugs treatment. 3. Varicose veins in the fundus of the stomach: when the varicose veins are damaged, it will cause gastric hemorrhage and the symptom of vomiting blood; it can be treated by applying growth inhibiting hormone to stop the bleeding, and if necessary, it will need surgical treatment. 4. Stomach tumor: once rupture of stomach tumor occurs, it will cause stomach bleeding and should be treated with surgery as soon as possible.