What happens in the body when someone who is caffeine-dependent doesn’t get their coffee?

Question

Does the other 90% of the brain that we can’t use get activated?

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edit: thanks for the scientific explanations

In: Biology

Answer 1

Part of what caffeine does is widen your blood vessels (which is why it is used in Excedrin as a headache reliever). So when you stop using it, the vessels constrict which is why you’ll get a withdrawal headache.