I should add that I went from 6 8oz cups of decaf to 6 8 oz cups of regular coffee. When I started drinking the regular my hands shook a lot. I should have taken the hint then. Of course there is caffeine in soda and chocolate so that needs to be factored in to total consumption also.
I googled "back pain caffeine" and there are some links tying caffeine to back pain but there is also a PubMed study saying the opposite. So maybe it's just that I'm particularly sensitive to caffeine and most others are not.
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