Why is the back of my knee aching me so much?

Why is the back of my knee aching me so much?For the past 6 months at least the back of my knee is aching & paining me so much?
I thought maybe i'd strained it through exercise but surely it would be fixed by now & not continue to ache on and off?
I really made a special effort to rest it too but still it really is sore.
What could it be & what should i do?
Thanks?
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Hi,I did the following:

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Knee Disorders Treatment, Causes, Exercises, Prevention Tips, Symptoms ...

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