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Why do onions make me cry?

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This answer contributed to Susan G. Komen for the Cure® What's this?
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jackson1250

Inside the onion cells there are some chemical compounds which contain sulfur. When you cut an onion its cells are broken and those chemical compounds then undergo a reaction that transforms them into a more volatile sulfured products, which are released into the air. These sulfured compounds react with the moisture in your eyes forming sulfuric acid.

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When you cut into an onion, a chemical is released that irritates your eyes. The tears are your eyes' effort to protect themselves.

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Maybe the smell of onion reminds you of an ex boyfriend and you get teary :) I am kidding people

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Right because onions go along with romance:)
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Jackson1250 is correct. Onions contain sulfur which is released in the air when you cut them. Your eye moisture (mostly H2O, water) reacts with the sulfur (S) to create H2SO4 (sulfuric acid). This irritates your eyes.

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sara, please stay away from onions. we don't want you sad... :-)

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Oh I'll try my best:) lol.
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ha! :-)
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Idk but it makes everyone cry have u ever heard a joke about onion goes like thiss....

U so ugly u made the onion cry hahahaah

It's a joke don't take any offence please don't

p.s your really pretty just seen yo pic

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No offences taken at all:) lol.& thanks about the last comment.
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No prob ima follow u k and if u want u can do the same u seem really kool
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Okie dokie:)
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When you cut the onion it produces some enzymes which contains some chemicals which irritates the eyes. These chemicals are amino acid sulfoxides, form sulfuric acids, they do quickly rearrange themselves into a volatile gas and goes in to the eyes.

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Fumes from the onion get in your eyes causing you to shed tears

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