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A brain freeze, also known as ice-cream headache and cold-stimulus headache, or its given scientific name ''sphenopalatine ganglioneuralgia'' (meaning "nerve pain of the ''sphenopalatine ganglion''"), is a form of brief pain or headache commonly associated with consumption (particularly quick 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 (palate), and is believed to result from a nerve response causing rapid constriction and swelling of blood vessels〔(How stuff works )〕 or a "referring" of pain from the roof of the mouth to the head.〔(Mayo clinic (causation) )〕〔(Medterms.com )〕 The rate of intake for cold foods has been studied as a contributing factor. 〔(Ice cream evoked headaches ICE-H study )〕〔(University of Guelph )〕 The term ''ice-cream headache'' has been in use since at least 31 January 1937, contained in a journal entry by Rebecca Timbres published in the 1939 book ''We Didn't Ask Utopia: A Quaker Family in Soviet Russia''. The first published use of the term ''brain freeze'', as it pertains to cold-induced headaches, was on 27 May 1991.〔 Note: the earliest recorded use of the term "brain freeze" (with a different meaning) was in 1968 in a Canadian academic journal.〕 ==Cause and frequency== An ice cream headache is the direct result of the rapid cooling and rewarming of the capillaries in the sinuses. A similar but painless blood vessel response causes the face to appear "flushed" after being outside on a cold day. In both instances, the cold temperature causes the capillaries in the sinuses to constrict and then experience extreme rebound dilation as they warm up again.〔''Scientific American Mind'', 1555–2284, 2008, Vol. 19, Issue 1. ''"Brain Freeze."'' Andrews, Mark A., Lake Erie College of Osteopathic Medicine.〕 In the palate, this dilation is sensed by nearby pain receptors, which then send signals back to the brain via the trigeminal nerve, one of the major nerves of the facial area. This nerve also senses facial pain, so as the neural signals are conducted the brain interprets the pain as coming from the forehead—the same "referred pain" phenomenon seen in heart attacks. Brain-freeze pain may last from a few seconds to a few minutes. Research suggests that the same vascular mechanism and nerve implicated in "brain freeze" cause the aura (sensory disturbance) and pulsatile (throbbing pain) phases of migraines.〔http://bmj.bmjjournals.com/cgi/content/full/314/7091/1364 Ice cream headache — Hulihan 314 (7091): 1364 – BMJ〕 It is possible to suffer from an ice-cream headache in both hot and cold weather, because the effect relies upon the temperature of the food being consumed rather than that of the environment. Other causes that may mimic the sensation of ice-cream headache include that produced when high speed drilling is performed through the inner table of the skull in people undergoing such a procedure in an awake or sedated state. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ice cream headache」の詳細全文を読む スポンサード リンク
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