It may be tht your pelvic/sacroiliac joint one one side is slightly out of whack. A good chiropractor, or a really good physical therapist ought to be able to tell you, and reset it, too. Either of them should order an x-ray before they try to move anything.

Have you ever landed badly on one hip or the other? Or sat down from any height? If so, this may be your problem.

Good luck,

Ingrid