Why onions make your eyes flood

Dramatic cinematic portrait movie poster, 1024x1536, with large bold fully legible title text in the top quarter reading 'Why Onions Make You Cry', and only this text in the image. Below it, a striking close-up of a sliced onion releasing a visible chemical mist toward a human eye, with tears forming, intense lighting, realistic detail, high contrast, documentary style.

Cutting an onion breaks cells and makes a sharp irritant vapor.

Closeup of a person dicing an onion with a knife on a wooden cutting board

onion, chef knife and candle on cutting board

How to Cut an Onion Without Crying

That vapor stings the wet eye surface and triggers tears to wash it away.

Tear Duct: Anatomy, Function and Common Conditions

dry-eye-anatomy

Vector crying blue eye with falling tears

A sharp knife, slow cutting, and chilling the onion can reduce the sting.

Portrait orientation. A chef’s knife beside a whole onion on a cutting board, suggesting careful preparation and reduced irritation.

Fans, running water, goggles, and leaving the root end for last also help.

drawing the tears of a crying eye

Why Onions Make You Cry

Cutting an onion breaks cells and makes a sharp irritant vapor.
That vapor stings the wet eye surface and triggers tears to wash it away.
A sharp knife, slow cutting, and chilling the onion can reduce the sting.
Fans, running water, goggles, and leaving the root end for last also help.

Why onions make your eyes flood

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