Usually, if the stone is small, there is less damage to the ureter and blood in the urine will not occur. After extracorporeal shock wave lithotripsy is performed, the stone will be slowly expelled from the body with the body. When there is no blood in the urine, it is due to the fact that there is no damage to the ureter from the fragmented stone. Or the lithotripsy caused by bleeding is small, when the lithotripsy out of the body, by the urine dilution will show no bleeding phenomenon, this situation is a normal phenomenon. Under normal circumstances, small stones can be discharged through the ureter, while stones larger than 0.6cm in diameter require extracorporeal lithotripsy or minimally invasive lithotripsy, after lithotripsy, the stone will be discharged with the urine. After extracorporeal shock wave lithotripsy, the urine should be observed for any abnormality and it is recommended to consult a doctor in time.