Over The Last Several Months When I Wake Up My

Over the last several months when I wake up my inner legs from the knee caps up are very painful. I have been working out but mainly on the treadmill and ab work. Nothing that would cause this pain in my inner legs (I can barely walk). I have some pain pills because it hurts so much however, it is very painful and I can not figure out why, can you help offer an explanation? Thank You