What causes rheumatoid arthritis?
Rheumatoid arthritis affects around 400,000 people in the UK. It can affect adults at any age, but most commonly starts between the ages of 40 and 50. About three times as many women as men are affected.
Rheumatoid arthritis is an autoimmune disease. This means that your immune system starts attacking your body’s own tissues instead of germs and viruses, which causes inflammation. Inflammation normally dies down fairly quickly but in rheumatoid arthritis it becomes a long-term (chronic) process. We don’t yet know exactly what sets off the inflammation in rheumatoid arthritis. There’s some evidence that lifestyle factors may affect your risk of developing the condition. Rheumatoid arthritis is more common in people who:
- eat a lot of red meat
- drink a lot of coffee.
Rheumatoid arthritis is less common in people who:
- have a high vitamin C intake
- drink alcohol in moderation.
The genes you inherit from your parents may increase your chances of developing rheumatoid arthritis, but genetic factors alone do not cause it. Even if you have an identical twin, who shares all the same genetic material as you, and they have rheumatoid arthritis, you only have a 1 in 5 chance of developing it too. And if some of your family have it, the severity can be very different from person to person.
Some people find that the weather, especially cold, damp conditions, seems to make their symptoms worse but the weather doesn't cause the condition itself.
The new Arthritis Research UK Rheumatoid Arthritis Pathogenesis Centre of Excellence will look into where and why rheumatoid arthritis starts. Researchers at King’s College London and the University of Manchester, funded by Arthritis Research UK, have also recently developed a new method to identify people that are at a very high-risk of developing rheumatoid arthritis, using a simple blood test and information about their smoking habits.