I'm not familiar with your age or medical history, but complaints of left arm numbness, especially with exertion, will often trigger an evaluation for coronary artery disease. This is because discomfort in the left arm is a vague but common presentation of angina. If coronary disease is not an issue in your case, then my concern about the arm discomfort would drop considerably. If the pulse and blood pressure in that arm is normal, you might think of it as a nuisance at that point. This won't make the discomfort go away, but the reassurance that something serious is not at the root of the problem might be comforting.
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