If you have back pain and hematuria, then the possible causes are: 1. Pyelonephritis. Pyelonephritis is an upper urinary tract infection that usually spreads from lower urinary tract infections. When pyelonephritis occurs, the patient may experience low back pain with hematuria and significant symptoms of urinary frequency, urinary urgency, and painful urination. It is recommended to take urine for routine examination to confirm whether pyelonephritis is present. 2. Kidney stones. It may cause back pain and blood in the eyes. If the stone causes ureteral obstruction, the symptoms of acute pain, acute lumbar and abdominal pain, nausea and vomiting may occur. 3. Tumors in the kidney or upper ureter can also cause symptoms of lumbar pain, lumbar distress and flesh-eye hematuria. When the tumor is small at first, the pain is not obvious, but with the growth of tumor volume, the symptoms of lumbar pain may appear gradually. Further CT and ultrasound examination of the urinary system is recommended to rule out whether the tumor is present.