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Laura M. Juliano, helmsman of Behavioral Pharmacology and Health Promotion at American University, Washington, DC:
"There have been some if it happens reports of people experiencing headache after drinking caffeine, but in imprecise caffeine does not directly cause headaches.
"Rhythmical caffeine consumption leads to physical dependence on caffeine, which manifests as withdrawal symptoms when a caffeine alcohol abruptly stops using caffeine. A spread out throbbing headache is a hallmark feature of caffeine withdrawal. The goal for this is that one of the pharmacological effects of caffeine is a constriction of blood vessels in the sense.
"When someone regularly drinks caffeine, the body adjusts in distillate fighting this effect. Then when caffeine isn’t consumed the consequence is that blood vessels dilate too much, which causes a trouble. It takes a little while for the body to readjust to not having caffeine and that is why caffeine withdrawal headaches can persist for a week or more. A individual doesn’t have to be a very heavy caffeine user to savoir faire a caffeine withdrawal headache. It varies from child to person but even as little as a small cup of coffee (100 mg of caffeine) each day could main to withdrawal if someone stops caffeine abruptly.
Source: MyHealthNewsDaily