Age
Although RA can occur at any age, the age of onset peaks between the ages of 20 and 45.
Gender
Up to three quarters of people with RA are women.
Family History
Rheumatoid arthritis does run in families although parents with RA are less likely to pass the condition on to their children.
It is thought that genes are only one component in the development of RA.
Smoking
Heavy smokers are four times more likely to develop RA than non-smokers.
Hormones
Women who have lower levels of reproductive hormones may be at higher risk.
Diet
There is no unequivocal evidence to indicate that high consumption of red meat and/or coffee are significant risk factors.
People who have a high intake of vitamin C may have a reduced risk of developing rheumatoid arthritis.
Alcohol
The Arthritis Research Campaign site states: "Those who drink alcohol in moderation are at less risk than either heavy or non-drinkers". It would therefore appear that both heavy drinking and complete abstinence from alcohol are significant risk factors.
Weight
Obesity is said to be a risk factor for RA.
