Why does the thing behind me knee hurt so much?!

Question: Why does the thing behind me knee hurt so much!?
Answers:

go to the doctor ASAP serously if you dont it might collapse is what happened to my gym teacher, he was out for over a month, trust just go doctor get an xray see whats goin on

you never know better safe then sorryWww@Answer-Health@Com

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Why does the thing behind me knee hurt so much?!

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