<Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> <P> Burping (also known as belching, ructus, eruptus or eructation) is the release of gas from the digestive tract (mainly esophagus and stomach) through the mouth . </P> <P> 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 and soft drinks in which case the expelled gas is primarily carbon dioxide from the drink itself . Common diabetes drugs metformin and Byetta 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 . Other causes of burping include: food allergy, gallbladder problems, acid reflux disease, H. pylori, and gastritis . </P> <P> The current Guinness World Record for the loudest burp is 109.9 dB, set by UK's Paul Hunn at Butlins in Bognor Regis on 23 August 2009 . This is louder than a jackhammer at a distance of 1 m (3 ft 3 in). </P>

Where does the air come from when you burp
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