The manifestation of hidden pain in the lower back after taking Kidney Stone Tong orally is because the drug is working. Kidney stone granule is a proprietary Chinese medicine with the effect of clearing heat, promoting dampness, activating blood circulation, relieving pain, resolving stones and removing stones. After the kidney stone enters the ureter, it will stimulate the mucous membrane of the ureter and cause a strong spasm reaction in the ureter, which is a normal process. If the pain is too intense, you can also use pain medication to relieve the pain. Patients are instructed to drink more water, consume 1500-2000ml of water to increase the urine volume and promote the early discharge of stones through more urination, and the lumbar pain can be improved after the stones are discharged.