I have been having pains in my chest, and I think it may be my heart. It causes me a lot of the time to feel like I'm breathing thick air, my heart beats hard for a few seconds to minutes some times. When it does beat hard I can feel it through my chest like its hitting my hand directly (well that's the best way I can describe it). It's starting to worry me because it hasn't been this caunstant before, just recently over the last wk. I workout and I excessize a lot. And it doesn't effect me when I do, only when I'm really just doing the avg thing during the day. Walking up or down stairs increases my heart beat more than it should or normally does and in other situations as well. Please if any one knows anything about this, please give me what information you can.