Back pain is not necessarily a kidney disease Chinese people are deeply influenced by Chinese medicine, so many of the patients with complaints of back pain suspect that they have “kidney deficiency” and ask for kidney examination and kidney supplementation treatment, which of course requires doctors to identify and treat. The causes of low back pain are complex, and careful observation and analysis are needed to identify the causes of low back pain. 80% of adults have a history of low back pain, and because some patients with kidney disease can have mild or severe low back pain, nephrologists often ask patients if they have low back pain when they are seen. Therefore, many patients simply think that back pain is a kidney disease, which increases mental tension, but in fact it is not. To be more precise, when nephrologists ask patients if they have low back pain, they are mostly referring to whether they have low back pain in the kidney area. The kidney area is the projection of the two kidneys on the back of the waist, that is, from the outside of the spine outward 5 centimeters, up to the 11th thoracic vertebra, down to the 3rd lumbar vertebra between the area. The low back pain that some patients understand does not refer to kidney pain, but refers to the entire low back, even including the lumbosacral pain. Nephrolithiasis is not low back pain, and low back pain is not nephritis. Kidney pain refers to pain in the kidney area that is felt by self or found by examination. In fact, the kidney parenchyma has no sensory nerve distribution and is painless. The pain that patients feel in the kidney area is caused by the involvement of the kidney peritoneum, ureter and renal pelvis. Kidney pain associated with kidney disease can be divided into three types: renal colic, dull pain in the kidney area, and distension in the kidney area. Renal colic is spasmodic pain caused by obstruction of the ureteral junction or ureter and increased internal pressure, which is characterized by sudden intermittent severe pain in the kidney area, often radiating to the ipsilateral lower abdomen and perineum along the ureter, accompanied by nausea, vomiting, pallor, sweating and hematuria. Dull pain in the kidney area is a kind of vague pain, mostly persistent, often accompanied by percussion pain in the kidney area, mostly seen in acute nephritis, acute pyelonephritis, pelvic effusion, congenital polycystic kidney, etc. The pain is persistent and severe, often accompanied by obvious systemic symptoms and percussion pain in the kidney area. It is usually caused by perinephric diseases, such as perinephric abscess, renal infarction, perinephritis, ruptured renal cyst, perinephric hematoma, etc. In fact, most patients with acute and chronic nephritis and nephrotic syndrome only have mild discomfort in the lower back, but rarely have severe back pain. People with low back pain often go to nephrology, orthopedics, rehabilitation, Chinese medicine and other departments, but it is difficult to make a clear diagnosis, which shows its complexity. Low back pain is one of the clinical manifestations common to dozens of diseases. The weight of human head, neck, upper limbs and trunk is borne by the lumbar region, and the posture, weight bearing and movement in daily life and work are all centered on the lumbar region. The lumbar region is also the central area connecting the thoracic, abdominal and pelvic cavities. Therefore, lumbar pain can be a manifestation of pathological changes in the tissues and organs of these structures. In addition, diseases of the spine, lumbar muscles, ligaments, the nervous system and diseases of the abdominal organs can also manifest as low back pain. Therefore, careful observation and analysis are needed to identify the cause of low back pain. Patients with kidney disease often have symptoms of low back pain (kidney pain), and nephrologists often ask patients if they have low back pain when they are seen. Therefore, many patients simply think that low back pain means they have kidney disease, which is not true.