Arthralgia
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The context here is specifically about ARF (Acute Rheumatic Fever). The user's query "Arthralgia" is very broad. Let me provide a comprehensive overview drawing from what I've found and my medical knowledge, organized by definition, causes, approach, and key distinguishing features.
Arthralgia
Arthralgia is pain in one or more joints without objective signs of inflammation (i.e., no swelling, erythema, or warmth on examination). It is distinguished from arthritis, which involves both pain and objective joint inflammation.
Key Distinction: Arthralgia vs. Arthritis
| Feature | Arthralgia | Arthritis |
|---|---|---|
| Pain | ✓ | ✓ |
| Swelling / effusion | ✗ | ✓ |
| Warmth / erythema | ✗ | ✓ |
| Reduced ROM | May be present | Usually present |
Distribution Patterns
- Monoarthralgia — single joint (consider infection, crystal disease, trauma)
- Oligoarthralgia — 2–4 joints (consider reactive arthritis, psoriatic arthritis, IBD-related)
- Polyarthralgia — ≥5 joints (consider RA, SLE, viral, ARF, fibromyalgia)
Common Causes
Infectious / Post-infectious
- Acute Rheumatic Fever (ARF): Migratory polyarthralgia/arthritis affecting large joints (knees, ankles, elbows, wrists), classically flitting from joint to joint. Responds promptly to NSAIDs. A major Jones criterion.
- Viral arthralgia: Parvovirus B19 (adults: symmetric small joint arthralgia), rubella, hepatitis B/C, arboviruses (Chikungunya, Ross River virus — prominent, debilitating arthralgia), EBV, HIV seroconversion
- Disseminated gonococcal infection (DGI): Triad of skin rash, arthralgia, and arthritis with bacteremia — Sherris & Ryan's Medical Microbiology, 8th Ed.
- Lyme disease: Migratory arthralgia early; true oligoarthritis later
- Whipple disease: Arthralgia/arthritis may precede GI symptoms by months to years — Robbins, Cotran & Kumar Pathologic Basis of Disease
Autoimmune / Inflammatory
- Rheumatoid arthritis (RA): Morning stiffness, symmetric small-joint involvement
- Systemic lupus erythematosus (SLE): Jaccoud arthropathy; arthralgia common
- Sjögren syndrome, mixed connective tissue disease, polymyalgia rheumatica
- Reactive arthritis: Post-infectious (GI or urogenital trigger), asymmetric oligoarthritis
Crystal Arthropathies
- Gout: Acute monoarthralgia (often 1st MTP, "podagra"), hyperuricemia
- Pseudogout (CPPD): Calcium pyrophosphate deposition; chondrocalcinosis on X-ray; may cause arthralgia in chronic form — Brenner and Rector's The Kidney
Endocrine / Metabolic
- Hypothyroidism: Arthralgia, myalgia, joint effusions
- Hyperparathyroidism / hypophosphatemia: Bone and joint pain
- Addison's disease (adrenal insufficiency): Myalgia and arthralgia are recognized features — Rosen's Emergency Medicine
Medication-Induced
- Fluoroquinolones, statins, aromatase inhibitors, checkpoint inhibitors, bisphosphonates — all recognized causes of drug-induced arthralgia — Goodman & Gilman's
Malignancy
- Leukemia, lymphoma, and metastatic disease can present with arthralgia (paraneoplastic or direct infiltration)
Other
- Fibromyalgia: Widespread musculoskeletal pain including arthralgia without true synovitis
- Hemochromatosis: Iron deposition in joints (2nd–3rd MCP characteristic)
- Sickle cell disease / avascular necrosis: Chronic arthralgia from bony infarction and joint destruction — Goldman-Cecil Medicine
Evaluation Approach
History
- Onset, duration, pattern (migratory vs. additive vs. intermittent)
- Associated features: fever, rash, oral ulcers, eye symptoms, GI symptoms, urethral discharge
- Recent infections (strep throat 2–4 weeks prior → ARF; GI/GU infection → reactive arthritis)
- Medications, family history, travel history
Examination
- Confirm arthralgia vs. arthritis (objective synovitis?)
- Extra-articular features: rash (SLE butterfly rash, psoriasis, DGI pustular rash), tophi, nodules, uveitis
Investigations
| Test | Purpose |
|---|---|
| CBC, ESR, CRP | Inflammation |
| RF, anti-CCP | RA |
| ANA, anti-dsDNA, complement | SLE |
| Uric acid, synovial fluid crystals | Gout/CPPD |
| ASO titre, anti-DNase B | ARF / post-strep |
| Lyme serology | Lyme disease |
| Parvovirus B19 IgM | Viral arthralgia |
| Thyroid function, ferritin | Metabolic causes |
| Joint X-ray / ultrasound / MRI | Structural assessment |
Special Contexts
Arthralgia in Children
Differential includes juvenile idiopathic arthritis (JIA), ARF, reactive arthritis, septic arthritis, Lyme disease, leukemia, and viral syndromes — Fuster & Hurst's The Heart, 15th Ed.
Arboviruses and Arthralgia
Chikungunya, Ross River, O'nyong-nyong, Mayaro, and Barmah Forest viruses are arboviruses that specifically cause arthralgia/myalgia syndromes — Goldman-Cecil Medicine.
Arthralgia in ARF
The arthritis of ARF responds promptly to anti-inflammatories. Where NSAIDs are given empirically before diagnosis, the classic migratory presentation may be obscured. Monoarticular involvement is increasingly recognized in high-prevalence populations. — Fuster & Hurst's The Heart, 15th Ed., p. 865–866
Summary: Arthralgia is a symptom, not a diagnosis. Its significance depends entirely on context — duration, pattern, associated features, and patient demographics narrow a broad differential to an actionable diagnosis.
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