The time to expulsion of a stone stuck in the ureter is generally uncertain and is usually related to factors such as the size of the stone and whether or not an impaction has occurred. After the stone detaches from the calyx, it is discharged down through the ureter, where it can become stuck due to the presence of three physiologic strictures in the ureter. The time it takes for the stone to be discharged depends mainly on the time it takes for the stone to pass through these three strictures. If the stone is less than 0.6 cm in size and passes through the strictures smoothly, it may be discharged in 1-2 days. If the stone is large or embedded in the three ureteral strictures, it may not be able to pass smoothly. At the same time, the stone embedded may also lead to urinary tract fluid condition, hydronephrosis, ureteral dilatation, etc., which needs to be promptly treated with medication or through surgical treatment to remove the stone. Once the stone enters the ureter, it is necessary to pay attention to the regular review, for the stone that can not be discharged should be dealt with as soon as possible to avoid aggravation of the condition.