Chronic polyarthritis

DDx

Inflammatory

Connective tissue disease, eg, rheumatoid arthritis, systemic lupus erythematosus, scleroderma, Sjögren's syndrome, adult Still's disease
Seronegative spondyloarthropathy, eg, reactive arthritis (Reiter's syndrome), psoriatic arthritis, ankylosing spondylitis, inflammatory bowel disease
Crystal-induced, eg, gout, pseudogout
Inflammatory osteoarthritis
Lyme disease
Paraneoplastic syndrome (especially in elderly, eg, hypertrophic pulmonary osteoarthropathy)

Noninflammatory

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