All of a sudden last night i started experiencing knee pain.i have had no trauma and did not fall. i have used a heating pad but it is stillput weight?

Ice.: You shoulde use ice, rather than heat. Ice reduces pain and inflammation. You can take an over the counter anti-inflammatory med that should help.

See Ortho if Needed: Usually most pain resolves on its own, however if it persists or you have swelling noted you may want to see an orthopedic doctor to evaluate it further. Use Ibuprofen or aleve (naproxen) around the clock for the next several days to help as well.