Just recently when i'm running I get a pain in my right leg, it's just by my knee on the outside of the leg. It mainly happens after i've run about three miles and more so when i'm running uphill. It's like an ache and it's becoming more frequent every time i run. I ran 6 miles today and it is very sore tonight especially when i'm coming down the stairs and putting pressure on it. It's not to bad when walking normally.
Has anyone any ideas what it is??
If so what is it and how can I treat it ??