Ice cream headaches, a.k.a. brain freeze, are caused when quickly-eaten cold foods come into contact with the roof your mouth. Since the mouth doesn't have time to warm up when eating or drinking quickly, the nerve center there panics and sends signals to your brain that indicate the body is freezing. Blood rushes to the brain and the eater feels a sharp, stabbing type of pain that lasts anywhere from 30-60 seconds in most people.
Strangely, ice cream is the most commonly cited cause for head pain, but it can be avoided easily. Most people feel that positioning the cold foods at the sides of your mouth will prevent brain freeze. This allows the food to warm up slightly before coming into contact with the roof of your mouth. If you're drinking something frozen, like a smoothie, don't aim the straw directly at the roof of your mouth, either. The other "cure" is simply to eat more slowly.
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