I run about 15k a week and I'm in my 30's. To my horror I've recently found what seems to be a varicose vein at the top of my left calf. It is tender to touch but not painful. The nurse doesn't seem to think I need to worry. Seeing as I've recently been doing more hillwork, could it be that this has brought on the problem? Also, will further hillwork exacerbate it?