Why do my knees click sometimes?

Knees click/crack when I walk up stairs?

Only when I walk up stairs. They just started doing this last night. Yesterday I took 5 hours of intense hip hop classes which requires a lot of bending in your knees. I'm ...show more
Answer:

There could be some wearing away of the articular cartilage behind the kneecap, it's called chondromalacia.

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