What part of the body attacks artritis?

Arthritis primarily affects the joints in the body, leading to inflammation, pain, and stiffness. The immune system mistakenly attacks the synovium, the lining of the joints, in autoimmune forms like rheumatoid arthritis. This can result in damage to cartilage, bones, and surrounding tissues over time. Other types, such as osteoarthritis, involve the wear and tear of cartilage rather than an immune response.