Presently, we do not know the exact cause of Rheumatoid arthritis. It is believed to be caused by a combination of genetics, lifestyle choices (such as smoking) and environmental factors (such as viral infections). But there has not been any conclusive evidence to prove this, hence there is no cure for the disease.
Other risk factors for contracting rheumatoid arthritis are:
Gender – being female means you are three times more likely to develop the disease than males.
Age – rheumatoid arthritis can occur at any age, but it is most common in adults between 40 to 60 years.
Genes – if one of your family members had rheumatoid arthritis, you are at an increased risk of getting the disease.
Smoking cigarettes increases your chances of rheumatoid arthritis.
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Arthritis Overview 
