Whether kidney stones are serious depends on the specific size and location of the stones, and whether there is accompanying kidney hydronephrosis or infection. If it is just a small stone inside the kidney, such as one with a diameter of about five millimeters, this situation is not serious. By drinking more water, urinating frequently, exercising more, and combining with medications like stone expulsion granules and stone expulsion solutions, the stones can generally be expelled from the body. If the stones are large and cause kidney hydronephrosis, or even lead to pyelonephritis or renal abscesses, this situation is more serious. It requires anti-inflammatory treatment and timely surgical intervention to remove the stones, relieve the obstruction of the urinary system, and protect kidney function.