After a 6 to 8 mile run with hills, it starts to tighten and hurt. I am trying to quit running if I feel much at all. If I keep running, it becomes painful to even extend my lower leg out. Then after showering, it hurts going up and especially down stairs. Almost like it is pinching on something bad? The pain is so bad, you want to hop down the stairs. Running flats does not aggravate it?? Just longer hilly runs or long regular runs?
What could it be possibly??
"ALL DAY LONG"