Small stones within the calyxes of the kidneys are usually not easy to pass. Stones in the renal calyx are more fixed and less mobile and are usually not easy to pass. If the stone is small, it may fall into the renal pelvis and drain into the bladder through the ureter to be expelled from the body, but the chance is very small, and it can only be removed by surgery. Small stones in the calyx of the kidney usually have no obvious symptoms and do not need to be treated, only need to be observed regularly, and a small part of them may be discharged on their own. If the stones are relatively large, there may be symptoms such as difficulty in urination, hematuria, renal colic, etc., and they can be treated with surgical procedures or extracorporeal shock wave lithotripsy. Kidney stone patients should eat less spicy and stimulating food, drink more water, exercise more, and develop good living and eating habits.