Hi there. Thank you for posting your question with Healthcaremagic. I will do my best to help you.
The most likely explanation for your knee pain
of your knee joints. This would be confirmed by the pain being somewhat worse following a lot of walking or climbing. In any case you will need to have both knees x-rayed for a start and take it from there.
There are a lot of things that can be done for this without surgery.
I hope that I have answered your questions fully and been of some help. If you have anymore questions please contact me again anytime.
Dr Andrew Rynne.