Influenced by the traditional concept of “low back pain” is “kidney deficiency”, patients with low back pain often visit nephrology clinics, worrying that they are suffering from kidney disease. But in fact, nine out of ten lumbago is not caused by kidney disease, but by other system diseases such as bone and muscle disorders, lumbar muscle strain, lumbar disc protrusion, contusion, sprain, muscle spasm, spinal cord tumor, myelitis and other spinal cord and spinal nerve disorders, as well as female gynecological pelvic inflammatory disease. Low back pain caused by kidney diseases is less common. Low back pain caused by different kidney diseases has its own characteristics. For example, low back pain caused by kidney stones is mostly caused by stones embedded in the ureter, manifesting as unbearable intermittent, episodic and severe colic, which may radiate to the perineum, accompanied by profuse sweating, nausea and vomiting. The back pain caused by acute glomerulonephritis, acute progressive nephritis and other renal parenchymal diseases, or by renal cysts or renal tumors involving the renal peritoneum, mostly shows persistent distension and dull pain. However, if acute glomerulonephritis and acute nephritis are accompanied by hematuria, swelling and hypertension, urine tests and blood tests can be performed to further clarify the situation. Kidney cysts and kidney tumors can be identified by ultrasound in addition to abnormal urine tests. In contrast, urinary tract infections with unilateral back pain, unbearable pressure and back percussion, accompanied by fever, chills and other cold-like symptoms, usually indicate acute pyelonephritis, or even kidney abscess formation and other critical conditions, and require routine blood and urine tests and ultrasound to make a clear diagnosis. Therefore, when you have low back pain, according to the nature of the pain, promptly find the cause of low back pain, you can go to the hospital first test urinary routine, urinary ultrasound and kidney function tests can exclude whether low back pain and kidney related, because most kidney diseases can lead to the above-mentioned test abnormalities, if there is no abnormality, it can prove that there is no kidney disease, but the above-mentioned other diseases caused by low back pain.