Genes, environment: The complete answer is unknown, but this is certainly a genetic disease. We have known to quite some time that RA clusters within families. There are non-genetic causes (environment), such as smoking, that also increases the risk of developing ra. The arthritis foundation has a webpage that attempts to answer this question: http://www.Arthritis.Org/who-gets-rheumatoid-arthritis.Php.
Answered 12/9/2018
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