Question: why does the side of my stomach hurt when i run?
Answer: What Causes Cramps While Running? The origin of a cramp depends on the type. Side cramp or ''stitch": This cramp strikes you in the side, as the name implies, or even in the lower abdominal area. It's mainly the result of shallow breathing, not breathing deeply from the lower lung, says Jeff Galloway, a 1972 Olympian.