Vomiting black water a few days after nephrectomy, need to consider gastrointestinal bleeding or black drugs and food caused, should be seen immediately, may need to fasting, the use of drugs to inhibit the secretion of gastric acid; if it is caused by the drug or food, may need to stop using, because of the vomiting symptoms, and antiemetic treatment. Vomiting black liquid may be upper gastrointestinal bleeding. Surgery is traumatic and may cause stress gastric ulcers, sometimes coffee-colored or dark red. Eating needs to be suspended, drugs that inhibit secretion of gastric acid secretion such as omeprazole or hemostatic drugs such as thrombin are needed, and emergency gastroscopy is needed to stop bleeding in severe cases. If you take some drugs or food with black color after nephrectomy, black liquid may appear when you vomit, this situation should also seek medical attention, and need to further find the cause. There may be other reasons for vomiting black water after nephrectomy, and it is recommended to consult the surgical department and gastroenterology department to deal with the situation to avoid the development of the disease.