It is not possible to generalize whether the stone can be expelled by itself. Due to the different nature, shape, size and location of the stones, and the individual differences of patients, the methods of expulsion are not the same. Treatment needs to be individualized according to the patient, and some patients can be discharged on their own. 1. Some stones with small diameter and smooth edges, even if they are located in the lower calyces of the kidneys, may be expelled by themselves by drinking more water and exercising more. 2. If the stone is smaller than 0.6cm with smooth surface, and at the same time there is no obstruction in the urinary tract below the stone, it can be treated with medication for stone removal. For example, uric acid stones can be treated with sodium potassium citrate, sodium bicarbonate to alkalize the urine, oral allopurinol and so on, it is also possible to discharge. 3. If the stone is less than or equal to 2cm, extracorporeal shock wave lithotripsy can be used for treatment, it should be noted that if there is distal urinary tract obstruction, pregnancy, bleeding disorders, etc. can not be used in this way. 4. If the stone is larger than 2cm, surgery is usually needed, such as percutaneous nephrolithotripsy. Once kidney stones appear, you should go to the hospital immediately, under the guidance of the doctor to correctly standardize the treatment.