Why Do Onions Make You Cry?

When you cut into an onion, you release a gas called syn-propanethial-S-oxide (SPSO). This gas irritates the eyes, causing them to tear up.

The amount of SPSO released depends on the type of onion and how it is cut. For example, red onions and shallots release more SPSO than yellow onions. And cutting an onion into small pieces releases more SPSO than cutting it into large pieces.

Some people are more sensitive to SPSO than others. If you are sensitive to this gas, you may experience more severe eye irritation, or even difficulty breathing.

There are a few things you can do to reduce the amount of SPSO released when you cut an onion.

* Chill the onion before cutting it. This will slow down the release of SPSO.

* Cut the onion under running water. This will wash away the SPSO gas before it can reach your eyes.

* Wear goggles or safety glasses when cutting an onion. This will protect your eyes from the gas.

If you do get SPSO in your eyes, there are a few things you can do to relieve the irritation.

* Rinse your eyes with cool water. This will help to wash away the SPSO gas.

* Apply a cold compress to your eyes. This will help to reduce swelling and pain.

* Take an over-the-counter pain reliever. This can help to relieve pain and inflammation.

If you experience severe eye irritation or difficulty breathing after cutting an onion, you should seek medical attention.

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