Whether bladder stones can be expelled from the body depends on the size of the stones. If the diameter of the bladder stone is less than 7 millimeters, in this case, by drinking more water and urinating frequently, relying on the flushing action of urine, the stones can be expelled from the bladder in most cases. However, if the stone is larger, with a diameter of 1 centimeter or more, it is difficult to expel the stone through conservative treatment and often requires surgical intervention, such as extracorporeal shock wave lithotripsy or holmium laser lithotripsy under cystoscopy to first crush the stone, then expel it through conservative treatment, or remove the crushed stones directly during the surgery.