see my response to your other post, sounds exactly like what i have, look up inguinal hernia, sypmtoms/early symptoms: (back pain, testicle pain, groin pain, what seems like butt muscle pain especially when you sit for a while, bend over, or warm up before the game, all associated with the same side of the body usually), let me guess, when you play soccer/football you are right footed : ) ? my advise see a hernia specialist as soon as possible because it could get serious....