I was actually thinking about starting a thread about some knee pain I've been experiencing. It started on my MTB while cranking into manuals or taking off in higher gears. Sometimes, as I put a large amount of pressure on my left leg, I get this intense pain in my left knee as it bends and goes away as soon as I relieve the stress on it. It's only gotten worse to the point where sometimes just kneeling down to pick something up will trigger the pain. Riding the fixed doesn't hurt until I try to resist the pedals, especially when I pull up with my left foot. It's driving me mad and I really hope I didn't seriously eff something up permanently. I'm only 24 and shouldn't be having knee problems already! Unfortunately, my bike is my primary mode of transportation and I can't really take a break.

I feel your pain, duder. Let's hope babying your knees will make them better.