Urethritis will hurt, mainly caused by inflammatory stimulation triggered by the urethral mucosal edema bleeding, due to the mucosal epithelium in the urethra has damage, urine flow through the urethra when the stimulation of the damaged cells and nerve roots, causing pain. In addition, the contraction of urethral muscles during urination can also lead to urethral pain. If symptoms such as painful urination, urethral tingling and urethral discharge occur, you need to go to the regular hospital in time. Normal urethra mucosa surface attached to a layer of polysaccharide protective film, this film can protect the urethra from acidic urine stimulation. When bacterial infection occurs in the urethra, the inflammatory substances produced by the bacteria will destroy the protective layer on the surface of the mucous membrane of the urethra, which in turn damages the urethra, and thus the acidic urine flows through the urethra due to the inflammatory stimulus caused by the pain of urination.