The location of lumbago in nephritis is in the kidney area, and the body surface is in the rib angle or rib and lumbar angle and other locations. The cause of nephritis occurring back pain is inflammation due to the body encountering factors such as colds and infections, producing antigenic and antibody reactions, and the formation of immune complexes deposited to the kidneys. At this time, the glomerular filtration barrier is damaged and there is protein in the urine, and the protein in the body decreases and hypoproteinemia occurs, so the plasma osmolarity decreases and the water outflow to the tissue interstitial space, causing the kidney volume to increase and the kidney peritoneum to be stretched and back pain occurs, which may also be accompanied by swelling of both lower extremities, weakness, poor nasal function and increased blood pressure. Generally, hormones and immunosuppressive drugs are used to treat the disease, and the condition of nephritis can be controlled or even cured by active treatment, and then the symptoms of back pain will disappear naturally.