What are the causes of rheumatoid factor high?

Rheumatoid factor high causes and rheumatoid arthritis in general, may also be caused by systemic lupus erythematosus and scleroderma. Can go to the local regular hospital for relevant examination, according to the results of the examination timely treatment. Rheumatoid arthritis may be caused by bacterial or viral infection, may also be caused by long stay in cold and humid environment. During the course of the disease, weakness of the limbs, persistent fever, weight loss, and even joint swelling may occur.