Fibromyalgia and rheumatoid arthritis can cause similar symptoms like pain, reduced mobility in muscles, and exhaustion. The symptoms may be difficult to distinguish if a person has both conditions.

The majority had no previous history of immunosuppressant therapy. 61 percent were rheumatoid factor positive. Researchers set out to determine the cancer incidence in these patients compared with ...

The usefulness of rheumatoid factor (RF) is hampered by low specificity ... who were negative for anti-MCV were positive for anti-CCP antibodies. Anti-MCV antibodies were also present in 6 ...