Why do we hiccup?

Under our chest, there is a strong muscle called the diaphragm. When we breathe in and out, this muscle moves down and up quietly. Sometimes the diaphragm squeezes suddenly and fast, like it is making a tiny jump. This sudden move pulls a quick rush of air into our lungs. Right at that moment, a small flap in our throat snaps shut, and the air is stopped all at once. That is why we make a 'hic' sound.

Hiccups usually start from eating too fast, drinking fizzy drinks, laughing a lot, or getting excited all of a sudden. When air or food rushes into the stomach too fast, the diaphragm gets upset and starts jumping. This is usually harmless and goes away by itself in a few minutes.

Everyone hiccups now and then, and even babies can hiccup before they are born, while they are still inside their mother. Scientists have not fully figured out why hiccups are sometimes so stubborn, but they know for sure it has to do with the diaphragm.