NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 8,098 terms related to cancer and medicine.

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rheumatoid arthritis
(ROO-muh-TOYD ar-THRY-tis)
An autoimmune disease that causes pain, swelling, and stiffness in the joints, and may cause severe joint damage, loss of function, and disability. The disease may last from months to a lifetime, and symptoms may improve and worsen over time.