Science
How do hiccups work?
Hiccups work as sudden, involuntary spasms of the diaphragm, the muscle under your lungs. Each spasm yanks in a quick breath that's abruptly cut off by the closing of your vocal cords — making the 'hic' sound.
See it in motion.
Watch a 2-minute animated lesson that shows exactly how hiccups works.
Step by step
- 1The diaphragm contracts suddenly and involuntarily.
- 2This pulls in a sharp, unexpected breath.
- 3The vocal cords snap shut, stopping the air with a 'hic.'
- 4Triggers include eating fast, fizzy drinks, or excitement.
- 5Most bouts are harmless and fade on their own.
Frequently asked questions
- What causes hiccups?
- An irritated or overstimulated diaphragm spasms involuntarily; common triggers are eating too fast, fizzy drinks, swallowing air, or sudden excitement.
- What makes the 'hic' sound?
- After the diaphragm jerks in a quick breath, the vocal cords snap shut abruptly, cutting off the air with the characteristic sound.
- Why do home remedies for hiccups sometimes work?
- Tricks like holding your breath or sipping water can raise carbon dioxide or stimulate nerves, helping reset the diaphragm's rhythm.