How is it physically possible to burp and hiccup at the same time?

The reason is simple human anatomy - a burp is gas that escapes the stomach (out the top, thank God), and a hiccup is a bubble of air stuck beneath your diaphragm (the muscle that makes your lungs breathe in). A hiccup is that muscle trying to get that bubble out from underneath it, contacting really fast in order to move it - which is why you make that funny noise - it's air getting sucked in really fast! So, when the two (uncomfortably) come together, you feel like your midsection just exploded and people look at you weird.

Happy burping/hiccuping!

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