I am 33 yr female, who was in good shape until about six months ago when a sudden pain/cramping feeling came in both of my leg muscles and occassionally in arms with use. The more I move the worse it gets. All my blood work looks fine. I did have an MRI of both legs that is showing edema in muscles and in compartments. I have seen both a rheumatoloist and Neurologist and they are puzzled. Has anyone else had similar pain or know what possible this could be?