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Some patients also have shortness of breath, an irregular heartbeat, or other heart problems. Many times, polymyositis is idiopathic. That means the cause of the disease is not known. But, there are some theories about the causes of polymyositis, including:
Dermatomyositis (DM): This type of myositis causes the muscle weakness of Polymyositis plus a skin rash. It is often characterized with areas of slightly raised reddish, scaly rash. The rash can be on the bridge of the nose, around the eyes, or on sun-exposed areas of the neck and chest.hese almost always cause weakness and may also cause muscle swelling and pain. Myositis can be caused by a number of things such as injury, infection or in combination with an autoimmune disease such as lupus.