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I'd just like to add to those who have found that lactose intolerance is linked to cramping while running. I am lactose intolerant and I have found that even jogging for not even ten minutes gives me horrendous intestinal cramps. I feel like I need to either pass out from the pain, throw up, or use the bathroom. I usually have to curl into a ball and let it pass - usually ten minutes later. Like another poster said, I get it on the treadmill too if I push myself too hard or for too long.
I'd just like to spread the word because when this first started happening to me, I was so frustrated and thought something else was wrong with me. I just stick with stationary, moderate/heavy exercise. For me, it's not worth it to push myself to run with such a looming threat!