Lately I've been feeling my left knee make a small clicking noise when I bend it. Normally it's quiet and I can't hear it but sometimes it's loud and other people can hear it. This has been worrying me though because I am a volleyball player who has also been doing conditioning lately. Last week, after I did practice, I felt my knee give out a little and a little bit of pain. I then went on to take about an hour break, go practice again, and the same thing happened. My knee would give out a few times as I was playing but it wasn't big and it didn't really bother me. Then, I did conditioning for my school on Monday, Tuesday, and Thursday. I would only feel some pain or the popping/clicking when I did lunges. Also, my left leg has been feeling a little more sore than my right has. Can anyone tell me what's going on?