Why do you get a headache if you drink really cold things too fast?

Question:

Answers:
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.

And according to Better Homes & Gardens:
To get rid of that pain quickly, press your thumb against the roof of your mouth right behind your front teeth.

Other Answers:
Your body is telling you to stop.

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. Therefore, the easy way to avoid brain freeze would be to keep cold things away from the roof of your mouth!"

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Why do you get a headache if you drink really cold things too fast?

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