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:
www.medicalnew...
mentalfloss.com...
www.healthline...
www.fasebj.org...