running problem?

Im 16 i run crosscountry and during today me and my friend were doing 10 miles at a pretty fast pace (7:30-8:00) min miles and during mile 8 my stomach hurt so bad i had to stop and its never happend before it was a cool day and i was hydrated so i dont know what caused this but it really really hurt.

Answers:
I also run a lot. When you stopped did you have to go to the bathroom? There are certain things you should probably not eat before you run. Go to runnersworld.com It is explained better there.

WHEN U DRINK ALOT OF WATER AFTER OR WHILE RUNNING UR LOWER STOMACH MIGHT HURT
go to your doc and ask if you have asma
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