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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 infection or less frequently, inflammation of the epididymis (the coiled tube on the back of the testicle). The majority of men that develop epididymitis develop it because of a bacterial infection. Although males of any age can develop epididymitis, it occurs most frequently between ages of 20 to 39.