is polymyositis an autoimmune disease
Polymyositis. Polymyositis is an autoimmune, neuromuscular disease in the myositis family. It is also referred to as a connective tissue disease as it involves the collagen and/or elastin that bind the body together.In Polymyositis, the bodyâs immune system attacks and degenerates muscles causing painful inflammation.olymyositis. Polymyositis is an autoimmune, neuromuscular disease in the myositis family. It is also referred to as a connective tissue disease as it involves the collagen and/or elastin that bind the body together.