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Pulmonary nodule
- ... and a loss of appetite. Hard bumps (rheumatoid nodules) under your skin near the joints. You may also need an RF test if your health care provider wants to check for other conditions that can cause high RF levels. These may include: Other autoimmune disorders, including: Sjögren syndrome . Lupus . Scleroderma . Juvenile idiopathic arthritis in children and teens. Chronic infections, including: Hepatitis C (liver). Tuberculosis (mostly affects the lungs). Endocarditis (heart). Certain types of cancer, including leukemia . ...