Osteoarthritis vs. Rheumatoid Arthritis: Key Differences

While they both fall under the "arthritis" umbrella and share certain similarities, these diseases have significant differences. Osteoarthritis is caused by the breakdown of cartilage that cushions your joints. Rheumatoid arthritis is an autoimmune disease in which your immune system attacks your body's own tissues in the joints.   

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Source: Verywell health