Infections of the urinary system belong to a very broad concept that includes infections of the urethra and bladder, as well as the prostate and bilateral ureters and kidneys in men. When an infection occurs, if the infected lesion enters the kidney, it can cause renal interstitial inflammation, which is different from glomerulonephritis. Because nephritis can be divided into renal parenchymal nephritis and renal interstitial nephritis, nephritis caused by urinary tract infections are renal interstitial diseases. If renal parenchymal disease, belongs to glomerulonephritis, mainly due to some specific causes, such as rheumatic immune disease, hemolytic disease, and primary glomerulonephritis or hypertension, diabetes mellitus caused by renal damage, can appear glomerular changes and nephritis. Therefore, nephritis caused by urinary tract infection is only interstitial renal disease caused by infectious factors, but nephritis can include interstitial nephritis as well as glomerulonephritis.