If the kidney stone enters the ureter, if it can be discharged from the ureter on its own, it is the best result for the patient, but often, because the stone can not continue to travel down the ureter and obstruct the ureter to appear hydronephrosis, and then the renal function is impaired. Treatment of ureteral calculi has three methods: First, spontaneous stone removal, for smaller stones (diameter less than 5mm), you can drink more water, more exercise to promote the discharge of stones, generally after a period of time, most of the small stones can be spontaneously discharged, if the stone is too large, the stone width is greater than the internal diameter of the ureter, the use of medication is not suitable for lithotripsy, at this time, the stones can not be passed through the ureter; Second, extracorporeal shockwave lithotripsy, for the diameter of more than 6mm, the ureter can not continue to travel, and thus kidney damage. Secondly, extracorporeal shock wave lithotripsy, for stones larger than 6mm in diameter, because its diameter is larger than the inner diameter of the ureter, usually can not be discharged by itself, often need to carry out extracorporeal shock wave lithotripsy, will be a large stone into a smaller volume of stones, the use of urine flushing effect of the one by one discharged out of the body. However, extracorporeal shock wave lithotripsy has its own contraindications, for example, patients with abnormal coagulation mechanism may lead to bleeding, and patients with cardiac arrhythmia may suffer from aggravation of cardiac arrhythmia due to extracorporeal lithotripsy. In addition, repeated extracorporeal lithotripsy can lead to ureteral stenosis or renal atrophy, must be careful, so you extracorporeal lithotripsy more than 2 times the stone still can not be broken, it is not suitable for extracorporeal lithotripsy; third, ureteroscopy, most of the ureteral stones can be removed through ureteroscopic surgery, especially for extracorporeal shock wave lithotripsy is ineffective for the majority of the patients can be used to continue treatment by ureteroscopic surgery. However, ureteroscopic surgery is carried out in the ureter, which may cause damage to the ureter, and should be performed with caution. Fourthly, percutaneous nephrolithotomy is only suitable for large stones (larger than 2cm in diameter) in the pelvic-ureteral junction or upper ureter, which are either ineffective or too inefficient to be treated by other methods. Percutaneous nephrolithotomy needs to make an eye in the kidney, and there is a certain amount of renal damage. Therefore, the indications are not as broad as ureteroscopy.