In epididymo-orchitis, the symptoms are similar and may begin rapidly or progress more gradually.

This is called epididymo-orchitis.

Epididymo-orchitis; Testis infection Orchitis may be caused by number of different types of bacteria and viruses.

Testicular sarcoidosis can present as a diffuse painless scrotal mass or can mimic acute epididymo-orchitis.

Orchitis can be related to epididymitis infection that has spread to the testicles (then called "epididymo-orchitis"), sometimes caused by the sexually transmitted diseases chlamydia and gonorrhea.

In the eighteenth century Boswell describes his attack of gonorrhoea, which is complicated by an attack of epididymo-orchitis, and, after a miserable six weeks of self-imposed confinement at home, rejoices that he is cured because all he can see is a slight 'gleet' which he is happy to ignore.