system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why do people hiccup?
gpt
It happens when your diaphragm gets irritated. Normally when you inhale, it pulls down to help pull air into the lungs. When you exhale it lets and air flow out of the lungs, back out through the nose and mouth. Sometimes the diaphragm becomes irritated. When this happens, it pulls down in a jerky way, which makes you suck air into your throat suddenly. When the air rushing in hits your voice box, your vocal cords close suddenly and you're left with a hiccup.