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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:
See below for more detailed information about polymyositis and dermatomyositis, the two most common types of myositis. There are at least three distinct patterns that can occur in people with myositis. Some people have: severe symptoms (acute myositis) that may settle in one to two years.