Why do my knees click sometimes?

Every step I walk up both my knees click, it's quite loud and even has woken my daughter before. My knees don't hurt normally but if I run upstairs they feel weak and hurt, ...show more

When I bend my knees or put pressure on them, they click, it is not very painful but very annoying. Should I see a doctor?

Here are some other things that my knees are doing. Catching or locking of your knee The sensation of your knee "giving way" I did play a lot of sports in high school. I really don't have pain but I do every now and then.

When I've been sitting for a while and stand up my knees crack/ click, when I limber up for exercise ( arm swings, etc.. ) I always click and pop somewhere is this natural I'm a teenage guy and it doesnt hurt or anything?

A lot of the time when i bend down my knees click! Do i have arthritis at a really young age or something?

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

i thin i pulled my medial ligament on the inside of my knee whilst playing football,it hurt loads for a day or two the gradually got better,there is still slight pain when i play sport and twist in certain ways but i think this is beacause I didnt rest...