First off, those numbers in Lewis' post are from 1994! The real numbers are unknown! It is now theorized that there are from 3-4 million with Lupus in the US.
Last year, through the LFA, I went to their National Education Symposium in Washington DC where we lobbied Senators and Congressmen to create a bill that would create a National Database for Lupus Patients.
Also, there is no known cause for Lupus. It, for now, seems to be a combination of predisposition through genetics and an unknown trigger in their environment.
As for the disease itself, no two people with the disease will ever have the EXACT same symptoms. One of the reasons why it is hard to diagnose and treat.
Regards,
LadyBrannon