What is it?
Myositis is defined as the inflammation of muscles ("myo" means muscle and "itis" means inflammation). The inflammatory myopathies are a group of disorders characterized by inflammation and weakness mainly of the muscles closest to the trunk of the body (proximal muscles). These disorders include polymyositis, dermatomyositis and inclusion body myositis. Myositis may be associated with inflammation in other organs, including the joints, heart, lungs, intestines and skin. In dermatomyositis, a rash develops in addition to the muscle inflammation.
What are the effects?
Each of the disorders associated with Myositis have different effects. Characteristics of Polymyositis can include:
How is it diagnosed?
To diagnose myositis, your doctor will ask you a series of questions about your symptoms, perform a physical exam and order several laboratory tests.
What are the treatment options?
Treatments can include rest, physical therapy and medications such as corticosteroids or DMARDS.