My iphone 4 is hot and won't turn on?

My Iphone 4 was in my pocket and started to get very hot, i took it out and it was off and will not turn on. It has cooled down since and have tried restarting it with no luck. Any suggestions would be greatly appreciated thanks.

Sounds like a battery issue, search for phone repairs in your area it should be around $50 depending on where you go. If your still under apple warranty try an apple store first, they won't charge.