The main painful parts of a urinary tract infection depend on what type of infection it is: 1. If it is pyelonephritis, the painful parts are mainly located in the lower back, often on both sides of the lower back, and are usually accompanied by an increase in body temperature. 2. If it is an infection of the bladder, it is mainly located in the small abdomen, that is, in the suprapubic bladder area, and can show symptoms of hidden pain in the small abdomen, cramps or pain when pressed. 3. The painful part of the urethritis is mainly located in the urethra, especially in the process of urination, the pain will be aggravated, manifested as burning and stinging symptoms in the urethra. 4, if the male prostatitis, also located in the urethra, mainly manifested as perineal distension and pain, such as after sitting for a long time or after holding urine, there is distension and pain or there is frequent urination, urinary urgency, there is hidden pain and discomfort in the urethra. Therefore, according to the location of the pain, we can initially determine which organ is infected. Upper urinary tract infections are mainly manifested as back pain, while lower urinary tract infections are mainly manifested as pain in the small abdomen and pain in the urethra.