Back pain after lithotripsy may be caused by irritation of the ureter when the stone is broken and expelled, or it may be that the stone has not been broken. When smaller stones are discharged from the ureter after lithotripsy, they reflexively irritate the ureter, causing it to spasm, which results in pain in the lower back. A few patients also experience nausea and vomiting. If the back pain is not relieved for a long time, the stone may not be broken, or the stone may be too dense, too hard, or the surrounding narrowing may prevent the stone from being discharged properly and cause pain. Extracorporeal Shock Wave Lithotripsy (ESWL) can be performed again under the guidance of a doctor. In addition, patients with back pain after lithotripsy are advised to go to the hospital in time for examination and treatment according to the doctor’s instructions to avoid delaying the condition.