Is my knee pain related to my obesity?

Yes: Excess weight puts stress on the joints/ it's very possible that losing weight would help your knee problem.

Yes: A person's knees take on a lot of stress when he carries a heavy backpack or gains 50-100 pounds in weight. Obesity can worsen knee problems such as pain, swelling, difficulty walking, or trouble climbing stairs. Even if the original cause of the knee problems were from another disease or injury, the heavier a person is, the more wear and tear the knees have to endure.