Epididymitis is an inflammation of the epididymis. The epididymis is the coiled tube at the back of the testicle. In most cases, an infection causes this inflammation.
Orchitis is an infection of the testicle. It is much less common than epididymitis. Orchitis usually spreads to the testicle through the bloodstream. Viruses commonly cause the infection.
Epididymo-orchitis is an inflammation of both the epididymis and the testicle.
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