Causes of Acute Arthritis
| Cause | Monoarthritis | Usually oligoarthritis (2–4 joints) | Usually polyarthritis (5 or more joints) |
|---|---|---|---|
| Common | Gout | Ankylosing spondylitis | Rheumatoid arthritis |
| Pseudogout | Systemic lupus erythematosus | ||
| Septic arthritis | Inflammatory bowel disease | ||
| Trauma* | Viral diseases (e.g. rubella, hepatitis B and C, infectious mononucleosis) | ||
| Haemarthrosis secondary to warfarin anticoagulation | Reactive arthritis following gut or genitourinary infection | ||
| Flare of osteoarthritis (overuse or minor trauma) | Psoriatic arthritis | ||
| Endocarditis (acute synovitis or tenosynovitis) | |||
| Uncommon or rare | Osteonecrosis | Sarcoidosis | Post-streptococcal infection |
| Pigmented villonodular synovitis | Whipple disease | ||
| Leukaemia | |||
| Vasculitis | |||
| Tuberculosis | Syphilis | ||
| Haemophilia | Adult Still's disease | ||
| Palindromic | Familial | ||
| rheumatism | Mediterranean fever |