rheumatoid arthritis occurs when the body attacks its own tissues
rheumatoid_arthritis is autoimmune_disease. rheumatoid_arthritis is not autoimmune_disease. rheumatoid_arthritis is arthritis. rheumatoid_arthritis is autoimmune_condition. rheumatoid_arthritis is not arthritis. rheumatism is arthritis. rheumatism is disease. rheumatoid_arthritis is disease. rheumatoid_arthritis is not disease.