It could be a back problem, as another poster mentioned and I have experienced. Last year, I had pain in my leg for months, and I hadn't quite realized that it coincided with my getting a different car, which was a bigger 'stretch' for me. I went to my primary who thought I had a leg problem, possibly a surface phlebitis, but he sent me to another specialist, an astute physician who realized as I was speaking about the car that the problem was my not my leg. He sent me to yet another specialist who diagnosed a back problem. Went for several months of physical therapy and the problem abated.

I caution you however, to use our input only as a rough guide; you must consult your phsyician. And perhaps a few. Let us know how you are.