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ANSWERS: 1
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When something cold touches the roof of your mouth on a hot day, it triggers a cold headache. The cause is a dilation of blood vessels in the head. The dilation may be caused by a nerve center located above the roof of your mouth -- when this nerve center gets cold, it seems to over-react and tries to heat your brain. for more on the subject: http://www.bmj.com/cgi/content/full/314/7091/1364
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