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When I play guitar I get lactic acid build up in my left arm (strumming arm, I play lefty) at the shoulder or elbow. It causes quite a bit of pain. I also sometimes get it in my right fingers (fretting hand).
I’ve adjusted playing position a few times and the one I found playing at the 3rd pickup (nearest the bridge) and sitting up really straight got rid off it almost completely.
Also, when I’m in a guitar lesson it seems to be worse but when I’m just jamming for fun (even in lesson), there’s no pain, nothing.
What could be causing the pain?