Low urination and back pain require further examination at the hospital to clarify the possible causes: first, pyelonephritis, which can present with back pain, elevated body temperature, accompanied by frequent and urgent urination, and reduced urine volume per discharge. This requires further urinalysis and ultrasound examination of the kidney to confirm the presence of pyelonephritis. Second, ureteral stones or kidney stones, stones cause complete obstruction, which can produce back pain, the urine produced by the kidneys can not pass through the obstruction site, and accumulate in the ureter or kidney, there will be hydronephrosis, ureteral dilatation, patients will appear to have reduced urine output, you need to go to the hospital for further ultrasound examination of the urinary system to confirm the diagnosis. Third, nephritis, various types of nephritis, can appear lumbar pain, hematuria, reduced urine output or swelling, proteinuria, etc., can appear increased urinary foam, accompanied by swelling of the limbs and face, urine color red, etc., need to go to the hospital for routine urine tests, kidney function tests, 24-hour urine protein quantitative tests to confirm the diagnosis.