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You're running, biking, or walking briskly along when. suddenly you're gripped with a sharp pain in your side. With each breath, the pain becomes more intense. You've developed a "side stitch," a sudden, sharp pain in the upper part of your diaphragm. No one is actually sure what causes side stitch, according to fitness expert Covert Bailey, author of the best sellers Fit or Fat and The New Fit or Fat. "