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Burping (also known as belching, ''ructus'', or eructation) is the release of gas from the digestive tract (mainly esophagus and stomach) through the mouth. It is usually accompanied with a typical sound and, at times, an odor. ==Physiology== Burping is generally caused by swallowing air when eating or drinking and subsequently expelling it, so in this case the expelled gas is mainly a mixture of nitrogen and oxygen. Burps can also be caused by drinking carbonated beverages, such as beer, soft drinks, energy drinks, and wine in which case the expelled gas is primarily carbon dioxide from the drink itself. Common diabetes drugs metformin〔(【引用サイトリンク】title=DailyMed: About DailyMed )〕 and Byetta〔(【引用サイトリンク】title=DailyMed: About DailyMed )〕 can cause burping, especially at higher doses. This often resolves in a few weeks. Burping combined with other symptoms such as dyspepsia, nausea and heartburn may be a sign of an ulcer or hiatal hernia, and should be reviewed by a physician.〔(【引用サイトリンク】title=Eructation (Professional Guide to Signs & Symptoms (Fifth Edition)) - WrongDiagnosis.com )〕 Other causes of burping include: food allergy, gallbladder problems, acid reflux disease, H. pylori, and gastritis. The current Guinness world record for the loudest burp is 109.9 dB, set by Paul Hunn on 23 August 2009.〔http://www.guinnessworldrecords.com/world-records/80129-loudest-burp-male〕 (This is louder than a jackhammer at a distance of 1 meter.) In microgravity environments burping is normally associated with regurgitation. The valve at the top of the stomach (the gastroesophageal junction) does not produce a tight seal, and in the absence of gravity, the stomach contents tend to float near this loose seal, making them likely to come up along with the expelled air.〔Vickie Kloeris (1 May 2001). (Eating on the ISS ). Interview with Lori Keith. National Aeronautics and Space Administration. Retrieved 2011-11-12.〕 Inability to burp is uncommon, and chest pain caused by dysfunction of the belch reflex is rare.〔()〕 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「Burping」の詳細全文を読む スポンサード リンク
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