Every day I run just a mile to stay in shape, and for the past week or so my chest has hurt after running for a few minutes. Today I running and on my last lap my chest, right where my heart is, hurt very bad. It hurt so much I stopped running and started to walk. And I'm only 16. I'm not out of shape, but I'm not in the best shape of my life either. It scares me a lot and I'm wondering what to do.
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