There are over 80 autoimmune diseases with Myositis and its subtypes included (Polymyositis, Dermatomyositis, Inclusion Body Myositis, and the Juvenile forms of Dermatomyositis and Polymyositis). There are also overlap syndromes with Myositis including other autoimmune diseases such as Scleroderma, Lupus, Sjogren’s Syndrome, Raynaud’s Phenomenon,  and others like Rheumatoid Arthritis.

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