Prostatitis does not usually cause redness in the urethra. The redness of the urethral opening is mainly caused by urethritis. The most important thing about prostatitis is that there is frequent, urgent and painful urination, there may also be white discharge after urination or defecation, and there may also be soreness in the perineum and behind the pubic bone. When prostatitis is severe, it may affect mental symptoms, including tension, anxiety, insomnia, and also impotence, premature ejaculation, etc. The redness of the urethral opening is mainly caused by inflammation of the local mucosa of the urethra. This condition is most often caused by urethritis, prepuce or foreign body irritation in the urinary tract.