There are many, many running-related causes of knee pain. Most are related to either overuse or bad biomechanics. But can you provide some more information - location of pain (inside, outside, above or below knee?), when it hurts (uphills? downhills? flat ground? does speed make a difference?), etc - that would help us point you in the right direction.
You might also want to post this instead in the Med Tent forum instead of Newbie Cafe - there are a number of people active in the Med Tent forum who are PTs and really know their stuff.
Heart of the City Run, Los Angeles, CA, 24:13
Downtown Anaheim 5K, Anaheim, CA, 24:32
Claremont Turkey Trot, Claremont, CA, 24:20
The Great Race - Old Agoura 10K, Agoura Hills, CA, 51:12
Fiesta Days Run, La Canada, CA, 49:31
LA Cancer Challenge, West Los Angeles, CA, 51:21
Long Beach International City Bank Half Marathon, Long Beach, CA, 1:54:31
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