Can constant arousal without ejaculation cause epididymis to swell and cause pain?can this cause permanent damage?

Sex and Men: Not in general. If you have these symptoms, however, i would advise a visit with your family physician.

Cause of testis pain: Also epididymal or spermatic cord pain. Such pain has been called "blue balls" or "lover's nuts". Could cause epididymis to feel a little swollen. Usually relieved by ejaculation, but shouldn't cause any permanent damage.