What Causes Knee Pain While Sitting And Standing?

I'm a 26 yaerold female I weigh about 230lbs and my knee pain has been developing over the last few months. it would only hurt when I went up and down stairs, but now it hurts when I sit, stand, lift my leg, lay, it straight, when I point and flex my foot and when I touch it. I recently began working out six days a week in January and although I have lost weight the pain just keeps getting worse