Lower back and abdominal pain after stone discharge may be caused by local injury, residual stones, infection and other factors. 1. Local injury: in the process of stone removal, the stone caused damage to the surrounding tissue, after the discharge of the stone still exists in the lower back and abdominal pain symptoms, but the pain will gradually reduce. 2. Existence of residual stones: more stones in the body, only part of the stones are discharged, there are residual stones in the body, may still induce symptoms of lumbar and abdominal pain, the pain is not alleviated, but also accompanied by frequent urination, hematuria and other symptoms. 3. Infection: when the stones are combined with infection, although the stones have been discharged, but there are still infections, there will be symptoms of pain in the lower back and abdomen, may also be accompanied by fatigue, fever, urinary frequency, urinary urgency and other symptoms. After the stone is discharged, the lower back and abdomen still hurts, and lasts for a long time, it is recommended to consult a doctor for a review, to determine the specific triggers, and timely treatment.