My daughter who is 12 yrs old, normal build, is in basketball. This is her second year. After she has been running awhile her right side just above her hip starts hurting her. It did this last year also. I've had the same thing happen to me over the years as well when I have been running and playing sports. What causes this and what's it called? My real concern now is that she gets the pain very quickly after just a minute or so of light running. It use to not happen to her until she had been running for quite sometime. Any help would be appreciated.