What Causes Swelling Testicles?

There are quite a few reasons for swollen testicles, one or both. For the sexually active group, STD might be the first to come to mind. However, swollen testicles can be caused by infection or non-infection.

Potential infectious causes

  • Epididymitis caused by STD chlamydia or gonorrhea. Epididymitis means inflammation in the tube through which sperms go from testicles to penis. STD chlamydia or gonorrhea can cause other symptoms than swollen testicles, it can be treated with antibiotics and can be cured.
  • Orchitis, meaning inflammation of one or both of the testicles, can be caused by several types of bacteria and viruses.

Potential non-infectious causes

  • Inguinal hernia, can also cause swollen testicles. Part of the intestine becomes displaced, slipping into the testis, can cause a noticeable bulge in the testicular sa, sweeling, sometimes pain, or a sensation of fullness.
  • Testicular masses, such as hydrocele and spermatocele can cause testicular swelling.  Testicular cancer rarely causes swelling though.


  • Swollen testicles can result from testicular torsion, the testicle twists inside the scrotum, causing an interruption in the blood supply to the testicle, and further lead to tissue death of the affected testicle. Testicular torsion is a medical emergency.


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* The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.