Joint Pain Without High Uric Acid: 5 Common Alternative Diagnoses

When uric acid is normal, gout is unlikely. Consider these prevalent causes:

1. Osteoarthritis (OA)

• Mechanical wear → cartilage loss, osteophytes, subchondral sclerosis.
• Knees, hips, DIP/PIP joints, 1st CMC, spine.
• Pain with use, stiffness <30 min, crepitus.

2. Rheumatoid Arthritis (RA)

• Autoimmune synovitis; symmetric small joints (MCP, PIP, wrists, MTP).
• Morning stiffness >1 hr, systemic fatigue, RF/anti-CCP +.

3. Systemic Lupus Erythematosus (SLE)

• Non-erosive arthritis; often migratory.
• Multi-system: malar rash, photosensitivity, renal, hematologic, ANA +.

4. Scleroderma (Systemic Sclerosis)

• Skin thickening + joint contractures, tendon friction rubs.
• Raynaud's, ILD, GI dysmotility, ANA (centromere/Scl-70).

5. Fibromyalgia

• Central sensitization → widespread pain, fatigue, sleep disorder, cognitive "fibro fog".
• Tender points (2016 criteria: WPI + SS). No joint inflammation.

Other Considerations

• Psoriatic arthritis, ankylosing spondylitis, reactive arthritis, viral (parvovirus, hepatitis), Lyme, sarcoidosis, malignancy.

Diagnostic Approach

1. History: pattern, symmetry, duration, morning stiffness, extra-articular symptoms.
2. Exam: swelling, warmth, ROM, deformities, skin/nail changes.
3. Labs: CBC, ESR/CRP, RF, anti-CCP, ANA, HLA-B27, uric acid (already normal).
4. Imaging: X-ray (erosions, joint space), US/MRI (synovitis, enthesitis).

Rheumatology referral for definitive diagnosis and disease-modifying therapy.