Osteoarthritis and rheumatoid arthritis have distinct differences. Osteoarthritis commonly occurs in middle-aged and elderly women and is caused by the wear, degeneration, and rupture of joint cartilage, leading to swelling and pain due to friction during joint movement. On the other hand, rheumatoid arthritis is caused by bacterial infections leading to the proliferation of synovium in the joints, causing swelling and pain. Over time, this condition can damage the joint's cartilage and meniscus, severely affecting joint mobility. The treatments for these two diseases are different. Osteoarthritis can be alleviated through rest, oral medication, and physical therapy to ease local pain. If these methods are ineffective after more than six months, surgical treatment may be necessary, mainly total knee replacement. However, the treatment for rheumatoid arthritis primarily relies on medication to relieve local pain by removing rheumatism. (The use of medication should be under the guidance of a doctor.)