The cause of hiccups has been hotly debated for thousands of years. In ancient Greece, hiccups were believed to be a sign that your enemy was talking about you. In medieval England, hiccups were thought to be the work of evil elves.
Today, we know hiccups occur when your diaphragm (DAHY-uh-fram) spasms. Your diaphragm is a dome-shaped muscle that helps you breathe. It can spasm when the nerves that connect to it get irritated.
A big meal, fizzy drinks, sudden changes in temperature, and excitement can all affect/effect those nerves. You can also get hiccups from swallowing air, such as when you chew gum, or as a side affect/effect of certain medicines.