The organisation says it is an autoimmune disorder, so rheumatoid arthritis occurs when your immune system mistakenly attacks your own body’s tissues.
It explains: “Unlike the wear-and-tear damage of osteoarthritis, rheumatoid arthritis affects the lining of your joints, causing a painful swelling that can eventually result in bone erosion and joint deformity.”
About 40 percent of people who have rheumatoid arthritis also experience signs and symptoms that don’t involve the joints, according to the Mayo Clinic.
It is a good idea to make an appointment with your doctor if you have any symptoms you think may indicate the condition.