 The cause of rheumatoid arthritis is obscure but it is associated with a family history, genetic and autoimmune problems, people ages 20-60, female gender 3:1 or a Native American background.
The cause of rheumatoid arthritis is obscure but it is associated with a family history , genetic and autoimmune problems , people ages 20 - 60 , female gender 3:1 or a Native American background .