Its happened a few times now, the first was when i was at a gig and the smoke machine came on and i had a huge pain in my chest, it knocked me back and i had to sit down, then just again i was sat down and i got a pain in my chest and when i tried to breathe it got worse, im not overweight and im only young, should i go to the Hospital? Thanks Oh and it just happens, not a reason for it, not that i am running or playing sports Only lasted 10 second but was intense Ahh, been to Docs, she said it sounds like a cramp, and nothing to worry about, thanks to all!