Swelling or inflammation of muscle tissue induced by the immune system, injury, or infection.
Inflammation and degeneration of a muscle.
Myositis is a rare disease that comes in multiple forms and is one of the inflammatory muscle myopathies. As with other inflammatory myopathies, myositis is believed to be an autoimmune disorder in which inflammatory cells surround, invade, and destroy muscle fibers resulting in muscle weakness or rash. Myositis is estimated to affect about 1 in 100,000 individuals. Although there are gender differences depending on the type of myositis, clear ethnic differences have not been identified. Recently, there is some indication that the incidence rate for myositis is increasing faster among the African American population as compared to other groups. Myositis has multiple possible causes including previous or current infection or virus, as well as certain medications. In some instances, there appears to be a familial link.
Inflammation of muscle tissue, usually voluntary muscle, most often caused by infection, parasite infestation, trauma, or degenerative muscle diseases.
Any of a group of muscle diseases in which inflammation and degenerative changes occur. Polymyositis is the most commonly occurring example, but myositis may be found in relation to systemic collagen diseases and a minority are caused by bacterial or parasitic infections.
Inflammation of muscle tissue, especially voluntary muscles caused, for example, by infection, trauma, autoimmunity, or infestation by parasites.
Muscle tissue inflammation, resulting in discomfort, sensitivity, and loss of strength, characterizes myositis. Varieties encompass myositis ossificans, polymyositis, and dermatomyositis.