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Arthritis 关节炎 It's a common misconception that arthritis is an old person's disease. While osteoarthritis is caused by wear and tear, and therefore most common among those over 65, rheumatoid arthritis is an autoimmune disease that can be diagnosed at any time. 人们经常误认为关节炎是一种老年病。虽然骨关节炎是由软骨组织磨损造成的，因此在65岁以上的人群中最为常见，但类风湿性关节炎却是一种任何年龄段人群都可能患上的自身免疫性疾病。 | 
