I don't know what's wrong with my knee. it sometimes hurts to walk. it becomes stiff sometimes. but sometimes it's ok. torn meniscus maybe? hope not.

Knee pain: You may have a meniscus tear in your knee. This is the lining of the joint. Sometimes a little piece gets caught and causes pain and stiffness, then it releases and everything is fine. I suggest you start with seeing your regular doctor and go from there.

Meniscus don't cuss.: Pretty much as classic description of a meniscus tear. But, to remove all doubt, you will need a consultation with a a specialist or even a family physician first.