Sharp Pain in the back of my left shoulder, moves to heart, what can cause this?

Michael

New member
I am 14 and recently I have been having pains in my left shoulder blade that after about a half an hour move to my heart, it has only happened twice in the last 5 day period but what could cause something like this, please help! I am quite honestly stressed and scared over this.

P.s. I drink caffeine once/twice a day and way about 170 pounds if that helps to diagnose something like this
 
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