Achy legs after running ?

kimmyj74

So My legs have been aching all the time. I'm doing C25K for the second time. Not over doing it. No shin splints and not soreness from lactic acid building up. Just a generalized ache in my thighs. Enough to have to take advil a couple times a day. I do believe I have early arthritis in my knees but just wondering everyone else's thoughts on these symptoms??