Ureteral stones can cause pain, ureteral stones caused by acute obstruction caused pain based on two principles: First, ureteral stones caused by acute obstruction, causing acute spasm of the ureter causing spasmodic pain. Second, the ureter causes acute obstruction when the stone obstruction of the upper ureter, the renal pelvis throughout the dilatation caused by acute hydronephrosis, reflex caused by renal colic manifestations. Of course, there are some patients have no symptoms, physical examination accidentally found ureteral stone obstruction, but at this time the renal hydronephrosis is serious, and even individual patients will appear in the renal cortex alveoli, or complete loss of renal function, this kind of insidious development of ureteral calculi are mostly caused by chronic stone obstruction.