hi
swelling in the knees elbows and fingers is commonly caused by:
1.Rheumatoid arthritis(especially if the pain is more in the small joints like fingers and associated with early morning
stiffness)
2.Seronegative arthritis(
psoriatic arthritis and other types of arthritis)
3.arthritis due to excessive formation of crystals(uric acid-causes Gout and other crystals pseudo gout)
initial lab tests normally include:
1.blood counts,ser,crp(quantitative),uric acid,blood for RA factor,blood for anti cop test(3rd generation anti cop test),Vdrl test,quantitative and qualitative ANA test(antinuclear antibody test),p-ANCA test.
2.urine routine and culture test.
3.advanced tests for autoimmune diseases like extractable nuclear antibody tests (ENA Test).
crystal induced non infective swelling of joints need to be treated with uric acid lowering drugs .
in view of the persistent autoimmune disease(mentioned under point 1and 2) needs to be ruled out.
very rarely gut autoimmune diseases like
inflammatory bowel disease may cause such symptoms.
suggest
second opinion with
rheumatologist.
hope this helps
Regards
Dr.N.Ananth