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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:
If you get sudden onset of congestion and it is infrequent, the most likely cause would be a viral infection. Viral infections, such as the common cold, are highly contagious and can occur at any time of the year, though they are more common in the wintertime. Not all colds act the same.