Why Does Ice Cream Hurt My Head?

Ice cream is a great treat, but you have to eat it slowly! Otherwise, you'll get what some people call a 'brain freeze,' which is a super bad headache that lasts for a couple seconds. But how does ice cream hurt your head?!
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SOURCES:
https://www.medicalnewstoday.com/arti...
http://mentalfloss.com/article/12293/...
https://www.healthline.com/health/sph...
https://www.fasebj.org/doi/abs/10.109...