Myositis.

Last updated Friday, February 11, 2005

Incidence and risk factors

Who gets myositis and why?

Myositis is a rare disease. In the United States, it is estimated that each year five to 10 out of every one million people get one of the forms of myositis.

Although myositis can affect people of any age, most children who get the disease are between five and 15 years of age and most adults are between 30 and 60. Like many other inflammatory diseases, most forms of myositis attack more women than men. The exception is inclusion body myositis, a form of myositis in which holes, called inclusion bodies, develop in the muscle fibers. This form affects more men than women.

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