Patient: Description of condition (onset, main symptoms, hospital visited, etc.): A stone in the lower left renal calyx was detected in September 2007. Recently, it is always painful. The urinary routine is normal, the function of both kidneys is normal and there is no effusion. The doctor did not recommend extracorporeal lithotripsy or percutaneous nephrolithotripsy, and told me to leave it alone, saying that the pain had nothing to do with it. Because it is in the lower calyx. I was given a prescription for elm and Youlite and told to review it regularly. Please tell me: 1. Will the stone in the lower calyx not cause pain and fluid accumulation and damage the kidney function? 2.Which one should be used for the ultrasound and X-ray results and why is it different? 3.How can I treat my frequent pain? 4.Which doctor’s statement is correct? 5. Is extracorporeal lithotripsy or percutaneous nephrectomy suitable for me?