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You brain is thinking all the time but your brain needs to feed off of something to think so you get head ache from thinking but not feeding your brain.
on June 07, 2013
on August 05, 2015
My hypothsis is because you become dehydrated when you don't have food, so I'm guessing the fluid is running out your body. Don't count this as a complete answer though, its just a hypothesis from knowledge.
on July 10, 2015