Brain Freeze: The Ice Cream Headache
Picture a hot day and a big bowl of ice cream. You take a huge bite and swallow it fast, and then a sharp ache bursts across your forehead. Many people call this feeling brain freeze, but your brain is not freezing at all, because the trouble actually starts in your mouth.
The top of your mouth is full of nerves and blood vessels. When something icy touches that spot, the blood vessels there shrink to hold in heat, and a moment later they open wide again. This quick change seems to set off nearby nerves, and those nerves carry a message to the brain, which gets mixed up about where the pain began. It feels as if the ache comes from your forehead, even though the cold touched your mouth.
The ache is harmless, and it usually fades fast. You can help it along. Press your tongue flat against the top of your mouth so it warms that spot. A small sip of water that is not cold can also help.
The best plan is to avoid the problem in the first place. Take small bites of frozen treats and let each one rest in your mouth for a moment. Then you can finish the whole cone without any ache at all.