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Over-the-counter NSAIDs include ibuprofen and naproxen sodium . Side effects may include stomach irritation, heart problems and kidney damage. People with rheumatoid arthritis often have an elevated erythrocyte sedimentation rate or C-reactive protein level, which may indicate the presence of an inflammatory process in the body. Other common blood tests look for rheumatoid factor and anti-cyclic citrullinated peptide (anti-CCP) antibodies.