How long it usually takes for a 9mm stone to fall into the ureter to be expelled depends on the smoothness of the stone surface and the degree of ureteral patency, and cannot be generalized. If the surface of the stone is smooth, 70% of 9mm stones can be expelled on their own. Under the guidance of the doctor, the patient can take stone drainage solution and drink more water and exercise, and the stone can be expelled in about half a month. If the surface of 9mm stone is rough and there is narrow ureter or polyp, it will not be easy to expel and it usually takes 1 month to several months to expel or even impossible to expel. In this case, patients need to undergo lithotripsy treatment, such as extracorporeal shock wave lithotripsy or ureteroscopic lithotripsy. In contrast, ureteroscopic lithotripsy is faster and usually results in intraoperative stone extraction or small residual stones after surgery. In addition, patients with ureteral stones should pay attention to avoid eating spicy and stimulating foods, as well as spinach and tofu in their daily life to avoid making their condition more serious.