First, the urinary stones do not hurt is equal to the disease is well First of all, we must understand that the main reason for the pain caused by stones is stone obstruction, urine outflow is blocked and cause pain. The degree of pain is related to factors such as the location, degree and time of urine obstruction. If the ureter is compared to a gutter, the renal pelvis is the pool. A few stones in the pool is not a big problem, but a few thrown in the gutter will block it. Renal pelvis small stones are very easy to be washed into the ureter obstruction caused by recurrent pain, which is “small stones is a small dog, see people barking; large stones is a big dog, see people do not bark” reason, that is, the ureteral stones, “dog” the smaller the more will bark. As the blockage time increases, the ureter will be progressive expansion, resulting in a reduction in the degree of obstruction, the pain is also reduced accordingly. But at this time, the ureter still exists incomplete obstruction, which can cause progressive aggravation of hydronephrosis, progressive impairment of renal function, and ultimately the complete loss of renal function and must be removed from the side of the kidney. Therefore, the stone does not hurt, is not equal to the disease is cured, in fact, the stone pain is not terrible, no pain is terrible. Secondly, why there are still residual stones after several surgical treatments The renal collecting system is like a big house, the renal pelvis outlet is the main door, the renal pelvis is the living room, and a total of 6~9 renal calyxes are the rooms that are connected with the living room. We firstly remove the stones blocking the main entrance and the living room, and then clean the rooms one by one. The entire lithotripsy process is carried out in a constant flushing process, and every time the stone is broken up and dispersed by the application of instruments, the stone will be immediately flushed to the rest of the rooms with the flowing water. Despite repeated room-by-room searches, a small number of stones may be missed. Postoperative residual stones are mostly small and most of them can be expelled from the body on their own, while only a few can be treated by extracorporeal lithotripsy or lithotripsy. On the other hand, stones are often combined with infections, and when lithotripsy continues for a certain period of time, the operation must be discontinued, otherwise a large number of bacteria into the blood, resulting in septicemia can be life-threatening, and this type of patients need to be lithotrized and removed in several stages.