什么是关节炎？

关节炎是一种疾病， which typically affects joint linings, causing pain, swelling, and stiffness. It can be caused by a variety of factors, including age, injury, autoimmune disorders, and genetics. In some cases, there may be a combination of factors that contribute to joint inflammation and pain. Common types of arthritis include osteoarthritis, rheumatoid arthritis, and psoriatic arthritis.