brain freeze

A brain freeze (also called an ice cream headache) is the result of the rapid cooling the blood vessels in the roof of the mouth, causing them to constrict and hurt. The body can't actually tell where the pain is coming from, so it decides on the middle of the forehead. This makes it feel like the brain has frozen, hence the name. It can be alleviated by drinking a hot beverage or by rubbing the forehead, although the sensation usually only lasts for about thirty seconds.

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