Why is my heart beating so fast? I'm suddenly shaking now. I don't know how this happened, all I know that I was playing a game then my heart started beating fast.

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Why does my heart start beating loudly and fast when I suddenly move? It lasts only for 4-5 seconds and sometimes I get nervous for no reason. - Quora

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Is it normal for your heart to beat fast even when you are lying down and not moving at all? - Quora

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Why is my heart beating so fast? I'm suddenly shaking now. I don't know how this happened, all I know that I was playing a game then my heart started beating fast.