IPhone audio doesn't work anymore?

My IPhone 4s is having audio issues. I can't hear music, YouTube, pandora, vine, and other app sounds without headphones plugged in. There isn't even a bar for volume that comes up when the headphones arent in. It still plays alarms, ringtones, and other random noises without headphones though.

Just today it randomly (I think) started working again and I was able to hear YouTube videos and music again. But then it stopped working after either it went to 3G, or the screen turned off for a second. But now it's back to not letting me hear anything. Let me know what any of you thinks could be the problem, or if I should take it to an Apple store to try and get it fixed. It's really annoying.

This happened to me try turning it completely off than on and if that dosent work ge get it checked at the apple store

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