DefinitionBy Mayo Clinic staff
Epididymitis is an inflammation of the coiled tube (epididymis) at the back of the testicle that stores and carries sperm. Pain and swelling are the most common signs and symptoms of epididymitis. Males of any age can get epididymitis, but it's most common in men between the ages of 14 and 35.
Epididymitis is most often caused by a bacterial infection or by a sexually transmitted infection (STI), such as gonorrhea or chlamydia. In some cases, the testicle also may become inflamed — a condition called epididymo-orchitis.
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