Rheumatoid arthritis (RA) is a chronic autoimmune disease that causes inflammation, pain, swelling of joints and also around tissues of joints, mostly in wrists and fingers. RA can also produce inflammation in lungs, pericardium, pleura, sclera, nodular lesions, and most common under the skin. Patients with autoimmune diseases have antibodies in their blood that target their own body tissues, where they can be associated with inflammation.
RA is affected by 1% of world’s population every year. It is seen more common in women (three times) than men. It can affect to any age of people but most common age is between 35-55. In some families multiple members can be affected.