caffiene and joint pain...

Caffeine usually constricts blood vessels, that could be affecting how much pain you feel. It's the other way around with tension headaches. Dilated blood vessels around the brain can cause a tension head ache and coffee (caffeine) will constrict those blood vessels giving relief the tension/headache.
 
Caffeine addiction may give you body ache. But I never heard about joint pain as such. You can drink coffee in a moderate amount otherwise you may get addicted to caffeine which is not good for your health.
 
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