For the past few weeks I have been experiencing a lot of discomfort in my left arm when exerting myself while exercising. I timed it today on the treadmill and it seems as though after about 30 seconds of jogging at 5 mph it reallly amps up. It then goes down when I start walking and then continue the cycle again if I start running. I am just getting concerned and wondering if I am in any danger?
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