Rheumatoid arthritis is a long-term condition that causes pain, swelling and stiffness in the joints. The symptoms usually affect the hands, feet and wrists.
There may be periods where symptoms become worse, known as flare-ups or flares.
A flare can be difficult to predict, but with treatment it’s possible to decrease the number of flares and minimise or prevent long-term damage to the joints.
Some people with rheumatoid arthritis also experience problems in other parts of the body, or more general symptoms such as tiredness and weight loss.
Rheumatoid arthritis is an autoimmune disease. This means your immune system – which usually fights infection – attacks the cells that line your joints by mistake, making the joints swollen, stiff and painful.