Kidney stones of 5 millimeters can be expelled in some patients and some cannot. It should be decided according to the location of the stone, urine flow, medication and other factors. 1.5 mm kidney stone can be possibly discharged: simple kidney stone, do more up and down vertical movement, drink more water, with tamsulosin to dilate the urethra, potassium sodium hydrogen citrate granules to dissolve the stone, it is possible that it will be discharged from the body with the urine. 2.5 mm kidney stones not easily discharged: if accompanied by ureteral infection, ureteral stenosis obstruction and other conditions, usually can not be discharged by themselves. Other treatment measures can be taken, such as percutaneous nephrolithotomy, extracorporeal shock wave lithotripsy and other methods. Kidney stones of 5 millimeters should be examined and treated in a timely manner as prescribed by the doctor.