causes and effects of rheumatoid arthritis
Rheumatoid arthritis is often referred to as RA. 1  The inflammation in the joints causes joint pain, stiffness, swelling, and loss of function. 2  The inflammation often affects other organs and systems of the body, including the lungs, heart, and kidneys.
Fast Facts. Rheumatoid arthritis (RA) is the most common type of autoimmune arthritis. It is caused when the immune system (the bodyâs defense system) is not working properly. RA causes pain and swelling in the wrist and small joints of the hand and feet. Treatments for RA can stop joint pain and swelling.