Urinary tract stones with a maximum diameter of <6 mm and a smooth surface are usually eliminated by urination, but if the stone is >8 mm, it may not be expelled and may remain in the kidney or ureter, or in the urethra, causing obstruction and pain or symptoms such as frequent or urgent urination. If the stone is small, it can be expelled. If it is large or combined with inflammation or edema, combined with urinary tract obstruction, etc., it may need to be cured by extracorporeal shock wave lithotripsy or surgery to break up the stone or remove it directly. For patients with previous urinary tract stones and a history of stone removal, stones of about 8 mm may be excluded. If the stone is more than 1 cm, it cannot be removed from the body, so when there are patients with urinary stones over 1 cm, they need interventional treatment such as lithotripsy or surgery to achieve a cure.