A week ago I noticed that the medial side of both of my lower legs had become quite sensitive to apply pressure to. There is no pain involved in weight bearing, and running does not cause it to become immediately more severe. The pain is about the same after a week of total rest, and is not localized to a very specific spot. I can feel tenderness if I apply pressure anywhere on the fibula from high near the knee to about halfway down the lower leg. I have had shin splints many times, and this is much different. As I said, it will not become irritated as I begin to run, like shin splints or compartment syndrome, but as I log more miles it becomes more severe over time. Any ideas about what this could be? How could it have come about so suddenly?