Comparing Osteoarthritis and Rheumatoid Arthritis

What is Rheumatoid Arthritis?

Rheumatoid arthritis is an autoimmune disease, meaning the immune system mistakenly attacks healthy tissues. In RA, this immune system attack affects the joints, leading to inflammation that can damage joints and even other organs.

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Review Date: 
March 12, 2014

Last Updated:
July 1, 2014