岔气是怎么回事? What's Causing That Stitch in Your Side?

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You're running. You're in the last quarter of the marathon. You're a beast! A champion! You're incredible!

But then, suddenly -- you feel a sharp pain in your side. It seems to get worse and worse, with every breath.

It's an attack of the side stitch.

And now you have to stop running for a while so it goes away.

But don't worry! Because you're not alone.

A study in the year 2000 found that 69 percent of runners had experienced a stitch, also known as exercise related transient abdominal pain, in the past year.

And people who exercised in other ways, like swimming or bike riding, also reported having gotten a stitch.

But even though they're so common, researchers aren't really sure where the pain comes from.

Remarkable that we don't know these things, even about our own bodies.

One possibility is that it's all about your diaphragm, the dome-shaped muscle between your chest and abdomen.

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