What is a hiccup? © iStock

What is a hiccup?

Medically know as synchronous diaphragmatic flutter, hiccups can give you a fright!

Asked by: Dian Milstead, Glasgow

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A hiccup comes from an involuntary contraction of the diaphragm, producing a sudden intake of air.

The glottis (the vocal apparatus of the larynx) slams shut at the same time, so that the column of air strikes the closed glottis to produce the characteristic, onomatopoeic noise.


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