you sound like my mom. you would probably have both. rhuematoid arthritis is the kind that attacks your immune system so they go hand in hand. its one of those things where many factors play into the disease. you might have some genetic factors that alone aren't enough to cause it, but when you combine that and drugs it could do it. just like high blood pressure, its usually a combo of both environmental and genetic factors. also, lupus is more likely to occure in women rather than men.