Celiac disease, which I have, is an autoimmune disease, so that's why I picked this book off of the library shelf. Apparently 75% of the people with autoimmune diseases are women. There's not really any confirmed reason why women are more susceptible to these diseases, but this book posits a few theories. It's written by Rita Baron-Faust and a doctor named Jill P. Buyon, and it surveys at least 17 autoimmune diseases, from rheumatoid arthritis to antiphospholipid syndrome.
I found chapter 1 to be the most useful, since it explains how autoimmune disorders work. The rest of the book is kind of freaky because it provides warning signs for various diseases, and if you're borderline hypochondriac like I am, you'll imagine you have all of them.