My knees click and feel like the joints are grinding when i go up stairs..what could this be and what do you think caused it?

You've Got Kneesles!: It could be a minor problem depending on your activities. Lots of athletes get that, without pain, and apparently without any long term problems. But there can be problems on the underside of the patella (knee cap) that can cause it too, but usually accompanied by pain. Best to get it checked out with your doctor. He or she will decide what to do based on a more detailed exam.