If there is a small crystal in the kidney, the treatment methods are as follows: 1. Regular review at intervals of about 3-6 months; 2. If the crystals increase more than 6mm during the dynamic review, it is recommended to undergo extracorporeal shock wave lithotripsy or take oral lithotripsy, lithotripsy granules, etc., and drink a lot of water. In most cases, the stones or crystals can be discharged by drinking more water.