Although rheumatoid arthritis (RA) treatments are very effective in reducing inflammation, chronic pain persists in 20 to 30% of patients. The intestinal microbiota can participate on the pain pathways and a decrease in Faecalibacterium has been associated with chronic pain and chronic fatigue. RA patients have an altered gut microbiota or dysbiosis. Among the bacteria that are most often differentially represented between RA and control, Faecalibacterium, was also found less abundant in RA patients. The composition of the gut microbiota has never been evaluated in relation to the clinical phenotype of RA patients and in particular to the presence of a diffuse pain. In this study, investigators will test whether the gut microbiota of RA patients, and in particular the decrease of Faecalibacterium, would promote pain sensitization phenomena, and thus, chronic pain despite the control of joint inflammation.
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Comparison of the frequency of intestinal Faecalibacterium between : - inflammation-free RA with persistent chronic pain patients and - RA remission pain-free patients
Timeframe: Baseline