ENAH and rheumatoid arthritis: The most common clinical manifestations of rheumatoid arthritis are knee pain, myalgia, muscle weakness, increased muscle enzymes, myogenic damage, etc. Irregular fever without chills appears before rheumatism and reveals insensitive to antibiotic therapy, and there are some abnormities in the blood test of autoantibody, such as anti-ENA antibodies, anti-ds-DNA antibodies, anti-platelet antibodies, anti-nuclear antibodies, and anti-cardiolipin antibodies.