A brain freeze is a short, intense headache triggered when something very cold touches the roof of your mouth. Its medical name, sphenopalatine ganglioneuralgia, is far more intimidating than the experience itself, which typically disappears within about 30 seconds. Despite how sharp the pain feels, a brain freeze is harmless and requires no treatment.
Why Cold Triggers Head Pain
The pain starts with a survival reflex. When you eat ice cream too fast, gulp a frozen drink, or breathe in freezing air, you rapidly drop the temperature of your palate. Blood vessels in that area immediately constrict, a reflexive attempt to preserve your body’s core temperature. What happens next is what actually hurts: those blood vessels rebound and dilate open quickly, sending a rush of blood through the area.
Research from the University of Galway tracked this process in real time using brain imaging. Volunteers who induced brain freeze showed a rapid increase in blood flow through the anterior cerebral artery, a major vessel supplying the brain. As the artery dilated and flooded the brain with blood, the volunteers reported pain. When the vessel constricted again moments later, reducing blood flow, the pain faded. Because the skull is a closed structure, that sudden influx of blood likely raises pressure inside it, and the body appears to squeeze the vessel back down before pressure climbs to dangerous levels.
Why You Feel It in Your Forehead
The cold hits the roof of your mouth, but the pain lands in your forehead or temples. This is referred pain, and it happens because of a nerve called the trigeminal nerve. The tiny muscles around blood vessels in your palate tighten and relax suddenly during a brain freeze, and that signal travels along the trigeminal nerve, whose upper branch extends into the midface and forehead. Your brain interprets the signal as coming from higher up in the head, so you feel a stabbing ache between your eyes or across your forehead even though nothing cold ever touched that area.
The Migraine Connection
People who get migraines appear to be more susceptible to brain freeze than the general population. This overlap has made brain freeze a useful model for headache researchers, since it’s one of the only headaches you can reliably trigger and resolve in a controlled setting. The vascular mechanism, rapid dilation followed by constriction, mirrors some of what happens during a migraine, which is part of why scientists study it. If you get migraines, you may notice brain freeze hits harder or more frequently than it does for people around you.
How to Stop a Brain Freeze Fast
The fastest fix is warming the roof of your mouth back up. Press your tongue flat against your palate and hold it there. The warmth from your tongue helps the blood vessels return to their normal state, cutting the reflex short. If that’s not enough, press your thumb against the roof of your mouth or drink something warm. The most effective first step is simply removing the cold food or drink from your mouth so the temperature can start recovering.
How to Prevent It
Brain freeze is entirely avoidable if you slow down. The trigger is a sudden, extreme temperature drop on the palate, so eating or drinking cold things more slowly gives your mouth time to adjust. Keeping frozen food toward the front of your mouth rather than pressing it against the roof also helps. On very cold days, breathing through a scarf or face covering reduces the chance that freezing air triggers the same reflex. The common triggers are ice cream, frozen or slushy drinks, ice cubes, popsicles, and simply inhaling frigid air through your mouth.
There’s no lasting effect from a brain freeze, no matter how painful it feels in the moment. It’s your body’s temperature regulation system working exactly as designed, just a little too aggressively for the situation.