There are different reasons why one testicle may appear bigger than the other. If one of your testicles is slightly bigger than the other, don’t panic, this is completely normal for most men and boys.

“Our previous studies and observations, taken together, led us to hypothesize that dietary L. reuteri may act to prevent age- and obesity-related testicular atrophy in mice,” those researchers noted. ...

Doctors also refer to a swollen testicle as testicular enlargement. It occurs when the scrotum (the sac surrounding the testicles) grows abnormally large. Testicular swelling occurs when fluid starts ...