The most likely cause of this pain is when a nerve gets trapped for a short time in the muscles around your ribs. It can be a sharp pain and goes away quickly. It can happen with deep breaths or without. It is not usually a problem. If this persists or gets worse in intensity, you may need to see a physician for an evaluation of the pain.
I don't think that is necessarily related to your heart. I've had those occassional sharp pains and it does sound like a nerve. Sometimes moving positions makes it better. Like something isn't lined up perfect, or getting pinched.
I personally have an irregular heartbeat and it is not sharp pains. It is a heaviness, sometimes a fluttering, but not sharp pains. And it is always in one spot, right atop my heart. Not around the ribcage.
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