I have lower abdominal pain on both sides. It started out on the right side and only hurt when I would run quickly, like when I played softball and ran the bases. I thought it was a hip flexor, but now I have some pain on the left side as well. It doesn't bother me to lift weights or run on the tredmill, but hurts when I make sudden movements (sprinting, jumping, running the bases). I'm 43 years old and in excellent shape.
Thanks,
Jeff