The knee is the largest joint in the body and supports almost its entire weight. If any element of the complicated knee joint is damaged, irritated or starts to degenerate, knee joint pain and other symptoms can occur. Knee pain from arthritis is usually due to osteoarthritis, although other causes include rheumatoid arthritis and post-traumatic arthritis. Symptoms of knee osteoarthritis usually come and go, becoming gradually worse and more frequent over a number of years, and can include aches, stiffness, swelling and periodic flare-ups of intense pain.
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