The answer: What they are is painful. And that's about as much as anyone knows for sure. There are several theories as to why they strike, though, says Hamilton. Some experts believe that, when ...

Whether you're a running newbie or have logged hundreds of miles, no one is immune to the sudden, debilitating, painful cramp in your side. Sometimes referred to as a side stitch, we asked experts to ...

Have you ever encountered a sharp, stabbing pain in your side while running? Recently, one of my cross- country runners suffered through that experience. When she asked me what to do, I began to ...