I have been big into sports for the past four month. Monday my knee started to hurt when i was running an mile. and since then my knee keep popping everything i tun my knee. Tuesday i did kickboxing at the school and Friday i was playing tennis and after 15 minutes my knee was hurting so badly. i didn't want to put any of my weight on it. I got an x ray done but it wont be back until next week. But now every single joint is hurting a lot. could i be in a flare? Maybe because i am favoring one side over another? Any ideas..