Question

what are reasons behind hiccups and yawning​

Answer 1

Hello!

When the air rushing in hits your voice box, your vocal cords close suddenly and you're left with a big hiccup. Some things that irritate the diaphragm are eating too quickly or too much, an irritation in the stomach or the throat, or feeling nervous or excited. Almost all cases of the hiccups last only a few minutes.

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