I'm not young I'm old. I've had heart issues before so it's something I do have to watch out for. Also a family history. Lost my Dad to a heart attack. While I don't know for sure I would guess a pulled muscle swelling and pushing on a nerve making pain radiate up and down your whole arm would feel similar to pain caused by a heart attack. So yea I was scared like I have never been before that I might be exhibiting symptoms.