English translation: disease activity in rheumatoid arthritis
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Explanation: Patients with rheumatoid arthritis have joint inflammation that comes and goes. Here we're referring to present, active inflammation -- periods of inflammation activity are also called "flares," not only in rheumatoid arthritis, but other auto-immune disorders such as systemic lupus erythematosus and multiple sclerosis. You may want to consider "flare" or "flareup" of joint inflammation or joint inflammatory activity.