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RA is a chronic type of arthritis. Early symptoms include fatigue, joint pain, and stiffness. As it progresses, rheumatoid arthritis may feel like the flu, with body and muscle aches and loss of appetite.
Lupus is an autoimmune disease in which a person's immune system attacks various organs or cells of the body causing damage and dysfunction.
An inflammatory muscular disorder that usually becomes apparent during adulthood. This disorder starts as a slow, progressive weakness and withers away (atrophy) of the muscles (myosites), especially the arms and legs.
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