Why is there a sharp pain in the left side of my back?

James

New member
I am a 14 year old male. I have been noticing on and off for maybe the past month or two that on the left side of my back, right under the shoulder blade (i can reach the spot with my left hand) that there are intermittent sharp pains. They make it so that i can't stand up completely straight, but the hurting lasts only a few seconds, dies down a bit, and then comes back and hurts again. What is this? Should i be worried?
 
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