Rheumatoid arthritis can be classed as a chronic disease which causes inflammation of the lining, or synovium, of the joints. It can lead to long-term joint damage, chronic pain, loss of function and disability.
Rheumatoid arthritis progresses to cause swelling of the joints which inturn leads to pain, warmth, stiffness and redness around the joint. As the diseases becomes established it can also cause joints to lose their shape and alignment, more pain, and loss of movement.