This month, we're going back to basics on MyRACentral:
"1. We Don't Know What Causes Rheumatoid Arthritis
These days, much more is known about RA, especially the process that leads to developing the disease - a combination of a genetic predisposition, abnormally autoimmune response and environmental or biologic triggers. However, how it all comes together and why it comes together in some people, yet not in others, is still unknown."
The rest of the post is here.