How long can you drink water after bladder cancer surgery is determined by the specific surgery method.1. If the minimally invasive surgery method of transurethral bladder tumor resection is used, generally 6-8h after surgery, patients can drink water after they have no nausea and vomiting and are fully awake from anesthesia. If there is nausea, vomiting or abdominal distension, the patient should stop drinking water after 24h. In most cases, the patient can drink water normally after 6-8h. A small number of patients are still anesthetized and not awake, so drinking is delayed until 24h later. 2, if the open cystectomy, you need to wait completely after surgery for the gastrointestinal tract to be ventilated and abdominal distension to be completely relieved before drinking. 3, if the total cystectomy is used, you need to wait until about 6-7 days after surgery before you start drinking, because the total cystectomy needs to take a section of jejunum or ileum for intestinal surgery instead of bladder treatment In this case, you need to wait until the anastomosis of the intestine is completely restored before you can eat and drink.