So anyways, I have been back into my cardio now for 2 full weeks. This Monday made the start of week 3. My cardio consists of 2~3 miles 5 days a week running wise. Anyways, yesterday I went for a nice little 2 miler. I was REALLY feeling good and cranked it out in 13:31, which is good for the weight I am running at right now. After I was done I still felt good and it was only 4pm. So I decided I would go for another 2 miler later on that evening. I noticed once I was done that my right knee was acting funny. It kinda hurt in the joint, but I had felt this before, so I figured it was just my body adjusting to either the running routine again or possibly the speed. Anyways, I go for another run around 9pm and just ran a 14:07 for 2 on that one...I wasn't out to break any records. However, once I got back and was stationary for a while, I noticed my knee felt very stiff. The joint feels like it has pressure in it. When I bend it all the way, I feel a decent amount of pressure and if I try to push from ass to grass to half way, I get some pretty uncomfortable pain. There was NO way I could do squats/lunges/leg press today b/c of this. There is no inflamation on the exterior of my knee, everything feels internal. The only standout features are the pain and the pressure. Anyone have any idea as to what may be causing this. I guess if it stays for a few more days I will hit up the doc, but I didn't know if this was the infamous "runners knee" or something more or less serious. Any help appreciated.