Myositis, also referred to as inflammatory myopathy, means inflammation of the muscles. There are different causes, however injuries, infections, or autoimmune diseases are central.
In the United States, there are an estimated 1,600 to 3,200 new cases per year and 50,000 to 75,000 people living with myositis.
Myositis can affect both children and adults. With the exception of one type of myositis, women are more likely to be affected by this disease than men.