I am 16 and recently started exercising with my volleyball team. We have been doing P90X, weights, pull-ups, abs, and lots of running. However, lately I've been having lower stomach pains. I feel that maybe I'm hungry, but the pain is still there. I've also noticed I'm not eating as much, but maybe that has to deal with the exercise? I'm not quite sure if this is normal, but I wanted to see anyways.