"An ice-cream headache, also known as brain freeze, cold-rush, cold-stimulus headache, or its given scientific name sphenopalatine ganglioneuralgia, is a form of brief cranial pain or headache commonly associated with consumption of cold beverages or foods such as ice cream and ice pops. It is caused by having something cold touch the roof of the mouth, and is believed to result from a nerve response causing rapid constriction and swelling of blood vessels or a "referring" of pain from the roof of the mouth to the head. The rate of intake for cold foods has been studied as a contributing factor."
