The sound you are hearing in your knees may be crepitus. This is the sound that two bones make then they grind together. It may be a sign that the cartilage in your knee is breaking down exposing some of the bone which allows the two sides of the knee joint to rub together. Crepitus can be an early sign of developing osteoarthritis. This is a very common type of arthritis that occurs in joints that are overused. If you are overweight, then you knee joints endure greater impact which can accelerate cartilage loss. The fact that you are not having pain is a good thing, but I am worried that you may start having pain as your knees get worse.
Because you do not have pain in your knees, I don't think you would benefit yet from seeing an orthopedic surgeon
, although this may be a doctor
you need in the future. At your stage, I suggest that you schedule an appointment with your primary care physician
. He or she can examine you knees and determine if crepitus is present. You may need x-rays of your knees to verify that there is cartilage loss. Either way you will definitely benefit from weight loss which will slow the progression of osteoarthritis.