Myositis is a group of inflammatory myopathies that are most commonly thought to impact the muscles (which they do) but they can also affect the heart, lungs, GI tract, and be associated with the development of cancer. Myositis is considered autoimmune in nature; the body begins attacking its own muscles, connective tissue, skin, blood vessels and other organs. It is estimated that between 50-75,000 people in the U.S.
have one of the forms of myositis. This makes it among the rare diseases. As such, there are no dedicated treatments or therapies that have been developed specifically for any of the inflammatory myopathies.
Broadly, there are three main types of myositis: dermatomyositis, polymyositis, and sporadic inclusion body myositis. TyRead more on themighty.com