Kidney stones with a diameter of 5~7mm can be discharged if there is no ureteral stenosis in the renal pelvis; however, if the stone is located in the renal sinus or even in the renal parenchyma, it is very difficult to be discharged.
Under normal circumstances, the diameter of the ureter is about 7mm, if there is no ureteral stenosis, the size of 7mm renal pelvic stones can be eliminated by drinking more water, urinating more often, and exercising more to promote the discharge of stones. However, if there is ureteral stenosis or the stone is not in the renal sinus, or if the stone is embedded, it is difficult to be discharged. Ultrasound, CT, imaging and other tests are needed to determine this.
In general, whether a kidney stone with a diameter of 5~7mm can be discharged from the body needs to be judged according to the specific location of the stone in the kidney and whether there is any narrowing of the ureter.