I have a pain on my upper hip. Currently it's on the right side, but earlier it was on the left side as well. When one side pains, the other side doesn't. For 6 odd months, the pain vanishes, as if I never had any pain. I play football, run around and the pain never returns. But suddenly it comes back someday without any reason. This time it came back around a month ago and only the right upper hip is the victim. It seems to have started while attempting ab crunches 3-4 years ago.