Lower back pain after lithotripsy can be caused by lithotripsy stimulation, ureteral obstruction, nerve irritation, incomplete lithotripsy and other factors. 1. Lithotripsy stimulation: after lithotripsy operation, small stone particles need to be discharged from the kidney, when passing through the ureter and other parts of the ureter, it can produce a large pressure stimulation of the local area, causing strong contraction of the ureter, and then there can be a pain in the lower back. 2. Ureteral obstruction: after lithotripsy, when the stone fragments are discharged through the ureter, obstruction occurs, triggering ureteral spasm, which can block the discharge of urine from the kidneys, leading to increased pressure in the renal pelvis and lumbar pain. 3. Nerve stimulation: there are nerve fibers around the kidneys and in the ureter to control and transmit pain, when the stone is not completely healed, it can cause urethral obstruction, resulting in urine accumulation and local swelling, which can stimulate the nerve fibers and the symptoms of lower back pain. 4. Incomplete lithotripsy: If the operation of lithotripsy is not standardized or the indications for lithotripsy are not accurate, lithotripsy may be incomplete, and there are still stones in the kidneys, which may cause greater pressure on the renal pelvis and calyces, and then lead to lower back pain. After lithotripsy, back pain should be treated promptly and appropriate treatment should be carried out under the guidance of specialists, which will help to alleviate the uncomfortable symptoms as soon as possible.