Rheumatoid arthritis is an auto-immune disorder which causes abnormal swelling of the body joints due to a sudden attack to the joints by the immune system of the body. This disorder is fairly common in the body parts that are more frequently used such as the knees, fingers, shoulders, wrists, elbows and the hips. Although rare, this disorder can also affect the ligaments or the tendons along with kidney, lungs, eyes or the heart..
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