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A hiccup ( ; also spelled hiccough) is an involuntary contraction (myoclonic jerk) of the diaphragm that may repeat several times per minute. In medicine, it is known as synchronous diaphragmatic flutter (SDF), or singultus, Latin for the act of catching one's breath while sobbing. The hiccup is an involuntary action involving a reflex arc.〔 Once triggered, the reflex causes a strong contraction of the diaphragm followed about 0.25 seconds later by closure of the vocal cords, which results in the classic "hic" sound. Hiccups may occur individually, or they may occur in bouts. The rhythm of the hiccup, or the time between hiccups, tends to be relatively constant. A bout of hiccups, in general, resolves itself without intervention, although many home remedies are often used to attempt to shorten the duration.〔(【引用サイトリンク】 title =Hiccups )〕 Medical treatment is occasionally necessary in cases of chronic hiccups. == Signs and symptoms == * A single or a series of breathing diaphragm spasms, of variable spacing and duration. * A brief (less than one half second), unexpected, shoulder, abdomen, throat, or full body tremor. * Hiccups may present as an audible chirp, squeak, "hupp", or if controlled, a quick inhaling gasp, sigh, or sniff. * Hiccups may present as brief but distracting or painful, frequent or occasional interruptions in normal breathing, with sudden momentary pain of the throat, chest, and/or abdomen. 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「Hiccup」の詳細全文を読む スポンサード リンク
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