I have this weird ache on the outside of my calf/shin - it's situated somewhere along the middle of the tendon (?) that runs from my ankle bone (the protruding part) up to the side of my knee. It starts aching and twinging sometimes when I'm riding, and I'm a little worried it's some kind of tendonitis moving in.

I've bumped up my weekly mileage some, but I'm also riding with studded tires now, so I think maybe my actual effort has increased by maybe 20-30% over the last 3 or 4 weeks. I don't feel the twinges specifically when I'm pedalling hard though, seems that it maybe comes when I've sat still with steady pressure for a while.

I'm trying to focus on easy gears and a higher cadence, (which is a bit harder with studded tires, you tend to bog down more and end up mashing), and "loosening" my knee and foot every now and then so that I'm not pedalling with my foot in a strange position.

Should I be doing anything else? It's not a big problem yet, but I don't know enough about typical cycling injuries to know if this is something to watch carefully. I'll be taking about a week off my bike come Christmas anyway.