If a patient with urethritis has back pain, it is recommended to go to the hospital for examination and clarification: 1. It may be a combination of pyelonephritis. When urethritis occurs, if it is not treated actively and effectively, the inflammation spreads further and causes infection in the renal pelvis, which can lead to back pain, accompanied by more obvious symptoms of urinary frequency, urinary urgency or painful urination. Patients are advised to undergo urine routine or urine sedimentation tests, and if there is an increase in tubular type in the urine, then it is necessary to consider the possible combination of pyelonephritis. 2. Kidney stones may be present, such as the presence of kidney stones, which can cause infection for a long time and lead to frequent urination and urinary urgency. If there are kidney stones, they can cause back pain and require extracorporeal shock wave lithotripsy or surgery.3. There may be a combination of lumbar disc herniation or lumbar muscle strain, the pathogenesis of which is not related to UTI, but it needs to be clarified after a specialist examination at the hospital.