side stitch

Although the exact cause of side stitches is unknown, physicians will agree that the diaphragm, a sheet of muscle that extends across the bottom of the rib cage, plays an important role in breathing. Just like your leg muscles, your diaphragm can fatigue and cramp when put under too much stress. That’s why side stitches tend to strike beginner runners or those stepping up pace or distance. The good news is that there are a variety of effective strategies that can help prevent this common problem.