A few years ago, I fell while walking my dog & landed on both knees. The right knee was swollen, but seemed to get better on it's own. But now my left knee is bothering me. I can't get down on both knees anymore, they hurt if I do. If I even touch my knee's, it hurts. The past few weeks, ive noticed that my left knee is painful if I bend it at all. Doesn't seem to be a problem if im walking or just standing, but I do have pain going up & down stairs, if I don't hold onto a railing or step wrong. I also have to be careful bending over to pick up anything on the floor, or even take clothes out of the drier. Is this something I should see a Dr. for? Since I don't seem to have a problem just walking or standing, wasn't sure if it was serious enough to see a Dr. Ive lost 80lbs through gastric bypass surgery 3 yrs ago & my knees hurt more now, than they did before surgery!