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Help answer this question below.
Richard Simmons.
...
Nah, really, lol. When the cold matter enters your mouth (or the back of your mouth), your body responds to the sudden drop in temperature by constricting your blood vessels to increase blood flow and minimize heat loss. The blood vessels then stop being constricted and this release is interpreted by the brain as pain, giving you the unique sensation. Hope this helps.
http://en.wikipedia.org/wiki/Brain_freeze

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