The first thing you should do to find the cause of back pain in nephritis patients is to do urological ultrasound and so on. The possible causes that can cause lumbago in nephritis are mainly acute glomerulonephritis and acute interstitial nephritis. These two types of nephritis will increase exudation in the acute stage, leading to an increase in the size of the kidney and stretching of the renal envelope, which will cause severe lumbago. In contrast, acute glomerulonephritis and chronic glomerulonephritis rarely cause severe back pain. In order to alleviate this back pain, the most important treatment is the treatment of the primary disease. As for acute glomerulonephritis, in addition to the application of hormones, it needs to be treated together with immunosuppressants. Once the renal interstitial exudation is reduced and the kidney envelope is not stretched, then the back pain will be relieved naturally. For these back pains caused by nephritis, it is recommended not to apply non-steroidal anti-inflammatory painkillers such as indomethacin, because these drugs themselves can cause kidney damage.