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When something very cold touches the center of the palate, the cold temperature can set off certain nerves that control how much blood flows to your head. The nerves respond by causing the blood vessels in the head to swell up. This quick swelling of the blood vessels is what causes your head to pound and hurt. Some people call this a "brain freeze," even though nothing is really happening in the brain - it's all in the blood vessels of the head.

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Q: Why does the cold make your head hurt?
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