When I'm walking, especially up and down the stairs, my knee joints really hurt its kind of painful but I just ignore the pain and run up and down the stairs so it starts to hurt less, also unless my legs are both properly on the ground they won't stop shaking, I can feel them shake and no matter what I do it doesn't stop, I doubt it's because I'm cold because the weather right now is around 30 degrees.

I've recently been recovering from pain in my right knee that occurs from lunging in fencing and from going up and down stairs (worse going downstairs). From a little research online I diagnosed myself with patella tendonitis or jumper's knee. Looked up some rehab exercises and got myself a good knee support. The knee is so much better after 2 months. Stairs are no problem now.