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A little wonder, every day

Why onions make us cry

The bulbs and roots of spring harvest whole onions on sale at an outdoor farmers' market in Rochester, Minnesota. Original file: [OnionBulbRoots.jpg](https://commons.wikimedia.org/wiki/File%3AOnionBulbRoots.jpg). Creator: Jonathunder. License: CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0). Attribution: Jonathunder. Downloaded from the verified Commons file page; unaltered image. Checked 2026-10-25.
Bulbes d'oignons. Original file: [Onion.jpg](https://commons.wikimedia.org/wiki/File%3AOnion.jpg). Creator: Donovan Govan.. License: CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0/). Attribution: Donovan Govan.. Downloaded from the verified Commons file page; unaltered image. Checked 2026-10-25.
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The bulbs and roots of spring harvest whole onions on sale at an outdoor farmers' market in Rochester, Minnesota. Original file: [OnionBulbRoots.jpg](https://commons.wikimedia.org/wiki/File%3AOnionBulbRoots.jpg). Creator: Jonathunder. License: CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0). Attribution: Jonathunder. Downloaded from the verified Commons file page; unaltered image. Checked 2026-10-25.

Listen to fact0:00 / —

When a knife damages onion cells, a chemical reaction produces the volatile compound syn-propanethial-S-oxide. It enters the air, irritates the eye, and triggers the tear glands to make tears.