What does rheumatoid factor high mean?

When physical examination, there are high rheumatoid factor symptoms, this value is high, what does it mean? The following is interpreted by Yang Tiesheng, chief physician of Peking University People's Hospital. After finding rheumatoid factor, then in fact one has to identify it, whether it is caused by rheumatoid arthritis or caused by other diseases. Other diseases include autoimmune diseases such as lupus erythematosus, Sjogren's syndrome, and other viral infections, as well as the elderly, some pregnant women, etc.