Epididymitis (ep-ih-did-uh-MY-tis) is an inflammation of the coiled tube (epididymis) at the back of the testicle that stores and carries sperm. Males of any age can get epididymitis. Symptoms of epididymitis may include: sudden or gradual pain in 1 or both of your testicles (balls) the bag of skin containing your testicles (scrotum) feeling tender, warm and swollen. a build-up of fluid around your testicle (a hydrocele) that feels like a lump or swelling.