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What causes brain freeze and why does it hurt so much?
Brain freeze, or sphenopalatine ganglioneuralgia, happens when cold food or drink hits the roof of your mouth, causing blood vessels to rapidly constrict and then dilate[2][4]. Your brain interprets this sudden expansion as intense pain, essentially acting as a survival reflex to protect your body’s temperature[6].
For a quick fix, press your tongue firmly against the roof of your mouth to warm the area back up[3][6]. You can also sip room-temperature water or cover your mouth and nose to trap warm air[3][6].
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