Our expert says:
Impossible for me to say, I'd be guessing completely. It could be the camber of the road that caused the problem, though it's unusual for that to happen on both sides. Often runners develop pain on one side because of this, not both.
So I think the switch to the road might be a little misleading, and the issue is more the volume of running. Maybe you just have a weakness in the muscles (often the glutes would cause this, but also lower back, core muscles etc.) that is causing you to develop a biomechanical problem while running. That's the kind of thing that can be assessed, but you'd have to see a biokineticist or a physio.
It could of course be something completely different - as I said, I'm guessing a little here. All the more reason to consider seeing someone. So while I hate to pass the buck, the only way to know for sure is to see someone about it.
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