Rheumatoid arthritis - Symptoms and causes - Mayo Clinic
https://www.mayoclinic.org/diseases-conditions
WebJan 25, 2023 · Rheumatoid arthritis is an autoimmune disease. Normally, your immune system helps protect your body from infection and disease. In rheumatoid arthritis, your immune system attacks healthy tissue in your joints. It can also cause medical problems with your heart, lungs, nerves, eyes and skin.
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