Here we go again

The last couple of weeks I have been struggling with knee pain. I am not sure what is causing it or why it started all of the sudden either. For some reason every time I ride the bike I get a pain in my right knee. It seems to be in the back of the knee in the tendon. If you are sitting on a chair with toes pointed up and heel on the ground and try to slide your foot back towards your body that is when the pain is the worst. But just walking, and stretching out my leg makes it hurt as well. I guess I am going to have to go into the doctor and see what is going on. I am hoping to get some advice from my cousin this weekend that is a PT. At least it is early in the season, but I really hope it isnt something severe.