Polymyositis. Polymyositis is a type of muscle disease called an inflammatory myopathy. Usually polymyositis affects the muscles that are closest to the trunk of the body.
It may be due to diverse causes that occur alone or in association with viral infections malignancies or connective-tissue disorders. The usual presenting feature is weakness in the muscles. It affects the muscles and connective tissues of the body and sometimes the joints too.
The main symptoms are weakness and inflammation of the muscles poly means many myo means muscle and itis means inflammation.
The main symptoms are weakness and inflammation of the muscles poly means many myo means muscle and itis means inflammation. PM has more inflammatory changes in the muscle tissue while NM has more necrosis and degeneration of the muscle fibers. Polymyositis is a connective tissue disease that triggers inflammation and muscular weakness. Polymyositis is a rare type of myopathy or muscle disease that causes inflammation and weakness of the muscles.