Back pain can not urinate, it is recommended to go to the hospital for further examination to clarify the specific causes, the possible causes are as follows: 1, pyelonephritis, the occurrence of pyelonephritis when patients can appear obvious pain in the lumbar region, accompanied by frequent urination, urinary urgency, reduced urination, or even a strong urge to urinate, unable to urinate, mostly due to bacterial invasion of the epithelium of the upper urinary tract, producing strong irritation symptoms, and produce obvious pain symptoms, the need for urinary system 2. Ureteral stones or kidney stones, stones cause complete obstruction of the ureter or kidney outlet, kidney fluid accumulation, urine retention in the body can not be discharged, it is necessary to carry out ultrasound or CT examination of the urinary system, and after clarifying the location of stones, it is necessary to carry out extracorporeal shock wave lithotripsy, or immediately carry out surgery to remove stones to avoid the degree of kidney fluid accumulation To avoid kidney damage, etc.