- 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)
- Osteoarthritis (degenerative joint disease)
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