It could be many things, but it may be a hernia also...if it does not quit hurting in a day or two, I would see a dr
What Is It When One Testicle Hurts?
My right testicle hurts sometimes but when it hurts now it seems to be getting worse. After a nights sleep it is fine.
See your doctor and discuss your problem with him or her it is a sign of something but have it checked before it goes into something serious.....the best to you....
Its definately cancer
It may be pierced... Inspect the testicle closely to ensure there are no metal objects threaded through your scrotum and testicle. If there are, you've got a genuine testicle piercing - to relieve the pain, remove the piercing and disinfect twice daily until the wound has healed.
Quit jerkin'
It means your Male hormones will drop, but does not affect fertility.