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Why do I experience headaches when I am not drinking enough water?

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Why do I experience headaches when I am not drinking enough water?
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Because the dehydration causes your brain to shrink away from the skull.. . The pain receptors pick that up - therefore headache
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lack of oxygen so i was told. just drink alot of water.
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Weatherman is on the right track. Dehydration between the skull and the brain is also the primary reason for people getting hang overs. When I used to drink I would always drink a quart of water before going to bed. Only 1 hang over...ever.
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