SilentOne answered Sunday September 4 2005, 10:38 am: And then someone gave you a simple answer... :)
Hiccups are spasms of the diaphragm, which cause you to involuntarily draw a sharp breath, "hic". Unfortunately the hiccup can also cause you to swallow that air, or the spasming might even have a "burping" (like patting a baby) effect on your stomach.
You swallow the air, or your stomach is settled by the movement of your diaphragm (ok, so I don't know about that one, but it sounds possible) and this causes you to need to burp.
Oh yeah, one last thing. Sometimes; well actually all the time when I drink carbonated drinks, I get the hiccups. If you're drinking a carbonated drink at the time, then it's the drink makin' you burp (Carbon dioxide coming out of compression inside your stomach).
karenR answered Sunday September 4 2005, 9:51 am: Here is what I found in the wikipedia. :)
Burping:
Physiology
Burping is typically caused by eating or drinking too fast, and thereby swallowing (aerophagia) and subsequently expelling air, in which case the expelled gas is a mixture of nitrogen and oxygen. Burps can also be caused by imbibing carbonated drinks such as beer, soft drinks, or champagne, in which case the expelled gas is carbon dioxide from the drink itself. Gastroesophageal reflux disease can also cause involuntary burping. Some studies ([1] ([Link](Mouse over link to see full location))) have suggested that aerophagia is not the primary culprit but that burping is in fact a learned (social) behaviour.
Hiccups:
hiccup
A hiccup is an involuntary spasm of the diaphragm; typically this repeats several times a minute until some home remedy is applied. The sudden rush of air into the lungs causes the glottis to close, creating the "hic" noise. It is sometimes written as hiccough, though this spelling is becoming archaic.
The causes of hiccups are unknown, but they can sometimes be brought on by eating quickly, taking a cold drink while eating a hot meal, eating very hot or spicy food, laughing vigorously or coughing.
Scribble answered Sunday September 4 2005, 7:31 am: I think that burping is just expelling waste gas from your digestive system.
Hiccups are a biological reflex involving the diaphragm. Sometimes the diaphragm becomes irritated, and when this happens, it pushes up in spasm and makes you breathe differently. When this irregular breath hits your voice box, you hiccup (hiccough, whatever).
Eating too fast can irritate the diaphragm, as can nerves or stomach problems. [ Scribble's advice column | Ask Scribble A Question ]
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