Who all gets lupus?

Genes, environment. This answer will change as we know more about lupus. We believe that for a person to get lupus, from the limited genetic information we have now, about 10% is from known genetic causes and remaining 90% unknown genetic causes and environmental causes. Environmental causes are largely undefined but important. Think about this: only 30% of identical twins develop lupus together.
Genetic 2/3 envr 1/3. There are genetic forces in about 2/3 of people and environmental factors in1/3.