I decided to start a new series of posts based on random ideas that will make a small, yet informative post. Look for more random facts in the future!
As you all should know, brain freeze is a small, short lived headache that results from consuming cold food or beverages (e.g. ice cream) really fast. This headache is caused by rapid cooling and rewarming of the blood vessels in the roof of your mouth; heat expansion/contraction causes the blood vessels to dilate, which is detected by the trigeminal nerve, which sends the pain signal back to the brain. This is all pretty simple, just like stubbing your toe; toe gets stubbed, the nerves relay the pain signal back to the brain and you feel said pain in your toe. "But why is pain from the roof of my mouth being felt in my forehead?" An excellent question. See, the trigeminal nerve is one of the primary nerves for detecting facial pain, as a result of this, the brain gets confused and thinks the pain is coming from your forehead.
Incidentally, the same expansion/contraction of blood vessels is what makes your face turn red after being outside on a cold day; this occurrence just doesn't cause pain.
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