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1 Gonorrhea and chlamydia are the most common causes of epididymitis in young, sexually active men. 2  Other infections. 3  For boys and men who aren't sexually active, epididymitis can be caused by a nonsexually transmitted bacterial infection.
Epididymitis is inflammation of the epididymis, which is a tube located at the back of the testicles. The tube stores and carries sperm. Epididymitis is most common in men aged 19 to 35 and is a frequent cause of military hospitalizations.pididymitis is inflammation of the epididymis, which is a tube located at the back of the testicles. The tube stores and carries sperm. Epididymitis is most common in men aged 19 to 35 and is a frequent cause of military hospitalizations.