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[–] 2 pts

It definitely does. Not that you're wrong about withdrawal causing it as well, but caffeine is often prescribed for head aches after certain surgeries.

I was told to buy over the counter STAY AWAKE trucker pills after a spinal tap to help with the terrible head aches, and it worked! I think it has something to do with relaxing your blood vessels, similar to nitroglycerin with angina.

[–] 0 pt

A headache could be your body dumping something like salt/heavy metals out of your brain. When you drink the coffee your body has to deal with this and it is just stopping this "detox"