Thanks very much for the replies. I believe (it has now completely subsided) the pain is just behind the knobly bit rather than on the actual knee cap. It tends not to hurt much during the run - it hurts most a while after I've stopped though today the recovery period for the pain was extremely short compared to last time.
If I'm honest, I didn't build up at all. I just jumped on the treadmill (training on a treadmill btw) and did 45 mins. I had maintained a decent level of fitness by walking to work and back every day which led to 90 mins total walking every day.
Will cross training/cycling/rowing strengthen the muscles in question or should I go about a specific type of training?
I used to run a lot a year ago or so, but took a break as I was working long hours and got out of the habit of doing it. Recently I've started going back to the gym for 90 minute cardio sessions of running, cycling, rowing and cross training - the problem is, it seems the running is causing my serious discomfort.
I took a day off of running and the pain significantly lessened, though today I went for a 40 minute run and to put weight on my knee is agony.
It hurts on my left knee, and feels like a stabbing pain toward the outside edge. Having read a bit I am desperately hoping it is runners knee and that it can be easily remedies - however I suffered with this about a month ago and had presumed it had passed, as soon as I ran, it reared its ugly head.
Perhaps it's time to reduce my cardio workout to rowing, cycling and cross training...hope not!