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A rheumatologist is a specialist who treats diseases of the joints, muscles, and bones. Learn how they can treat autoimmune diseases like lupus. A rheumatologist is a specialist who treats diseases of the joints, muscles, and bones. Learn how they can treat autoimmune diseases like lupus.
Rating Newest Oldest. Best Answer: Rheumatologist specialize in connective tissue diseases like rheumatoid arthritis, lupus, fibromyalgia etc. Pressumably you have symptoms that might indicate that you have one of these problems, but your blood work was inconclusive. Therefore you doctor wants you to see a specialist.