Epididymitis?: A single swollen testicle, especially if painful, usually is due to epididymitis -- infection or other inflammation of the sperm collecting tubules. At your age (23), chlamydia and gonorrhea are by far the main causes. Working out, even intensely, shouldn't do this. Rare cases are torsion, a surgical emergency. If painless, probably less serious. No matter what, see a doctor ASAP. Good luck!
Answered 3/14/2016
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