Is it normal to have hematuria after placing a double J-tube? After ureteral stone surgery or kidney stone, it is necessary to place a double J tube inside the ureter after surgery, so it is normal to have hematuria after surgery. If the patient exercises a lot, the double J-tube will rub more violently in the ureter, and the hematuria caused will be more serious. Patients are usually advised to have less activity and drink more water after placing the double J-tube, so as to reduce the occurrence of hematuria. If more severe hematuria, especially fresh hematuria, occurs despite less activity and more water, this is abnormal and requires prompt hospitalization.