Lower ureteral stones are difficult to expel because of the narrower lower ureter. Under normal circumstances, there are three narrow parts of the end of the ureter, ureteral stones in the downward discharge, may be stuck in the end of the narrow parts of the ureter, it will be difficult to discharge, mainly the diameter of the stone is greater than 0.6 centimeters is difficult to discharge. If the diameter of the ureteral stone is less than 0.6 centimeters, it is usually able to pass through the narrow part and be expelled from the body by itself. If the ureteral stone is larger than 0.6 centimeters in diameter and stuck at the end of the ureter, extracorporeal shock wave lithotripsy can be considered. For unusually large diameter ureteral stones or if the effect of extracorporeal lithotripsy is unsatisfactory, ureteral lithotripsy with flexible ureteroscopic lithotripsy should also be considered.