Why are brain freezes so painful?

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Tags

1. #results
2. #which
3. #stimulus
4. #sinuses
5. #capillaries
6. #sensation
7. #cause
8. #vessels
9. #nerve
10. #blood
11. #caused
12. #brain
13. #cream
14. #freeze
15. #vasoconstriction
16. #cooling
17. #causes
18. #narrowing