Most of the kidney stones <6mm can be expelled on their own, but it is not possible to generalize and there is a great deal of individual variation. Whether kidney stones can be expelled on their own is usually delineated by the size of 6mm. If the stone is less than 6mm, most of them can be eliminated by drinking a lot of water and exercising, etc. However, not all stones smaller than 6mm can be eliminated by themselves. However, not all kidney stones smaller than 6mm can be expelled on their own, such as some abnormal shape of the kidney stone may be stuck and can not be expelled from the body. If the kidney stone is ≥6mm, it is very unlikely to be expelled through the ureter. Excessive intake of water may also cause hydronephrosis, and in severe cases, renal function may be impaired. For larger stones that cannot be discharged on their own, doctors will recommend surgical treatments such as extracorporeal shock wave lithotripsy, ureteral flexible (rigid) lithotripsy and percutaneous nephrolithotripsy based on the patient's overall condition. Whether kidney stones require surgical treatment or not, please go to the hospital in time to see a specialist to evaluate your condition and choose the appropriate treatment.