At least twice a year I have severe knee pain. Sometimes it isn't so bad and it will go away within a couple of days. Other times it lasts at least a week and it hurts whenever I jump, run, etc. As background, I have played volleyball for four years year round. I don't know if that has anything to do with it, but I'm hoping not. Now on my left knee I landed on it when I was on the bus, and then several other incidents with me dropping something on it has caused the pain. On my right knee, it will hurt without me having to even touch it. Any diagnosis? I have researched on knee pain and nothing seems to fit my case. The doctor said to do stretches and gain strength in my hips, as well as ice the knee that hurts. I've been doing that whenever they begin to hurt, and it doesn't seem to work.