Unknown but possibly an autoimmune disease in those with genetic susceptibility and may be triggered by an environmental agent (Toxoplasma, Borrella, coxsackievirus).
It causes muscles to exhibit varying degrees of decreased strength, usually affecting those muscles that are closest to the trunk of the body. Trouble with swallowing (dysphagia) may occur with polymyositis.
Myositis is a general term for inflammation of the muscles. There can be several causes. The most common being polymyositis and dermatomyositis.
Dermatomyositis is identical to polymyositis with the addition of a characteristic skin rash.
Polymyositis is an inflammatory muscle disease causing weakness and pain.
In polymyositis, symptoms include muscle weakness, particularly in the shoulders or pelvis, that prevents the patient from performing everyday activities
The prefix for the word polymyositis is "poly-," which means many or much.
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polymyositis
Polymyositis is a weakness that occurs in the neck muscles causing them to become limp. It also leads to swelling and muscle pain, general fatigue and soreness in the back.
A progressive condition, usually beginning in adulthood.
The causes of IM are not known. An autoimmune process is likely, as these conditions are often associated with other autoimmune diseases and because they respond to immunosuppressive medication.
It appears that granulomata (sarcoidosis) per se does not exert a significant ill effect on surrounding muscle cells. Some times polymyositis leads to a diagnosis of sarcoidosis.