Characteristics of patients with rheumatoid arthritis and concurrent fibromyalgia

Pain out of proportion to joint abnormalities

Greater mood disturbances

Greater sleep disturbances

Neuropathic symptoms

Often seronegative

Low inflammatory markers (CRP, ESR)

Less inflammation (joint examination, joint ultrasound)

RA: rheumatoid arthritis; CRP: C-reactive protein; ESR: erythrocyte sedimentation rate.

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