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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:
Myositis is a general term that means inflammation of the muscles. The symptoms are muscle weakness, tripping or falling, and fatigue (tiredness) after walking or standing. It can feel like permanently having the flu.If the throat or chest muscles are affected, it can cause difficulty swallowing or breathing.Myositis can result from infection, certain medications or, most commonly, an underlying problem with the immune system.Dermatomyositis and polymyositis are types of myositis caused by the immune system mistakenly attacking the muscles as if they were invading germs.f the throat or chest muscles are affected, it can cause difficulty swallowing or breathing. Myositis can result from infection, certain medications or, most commonly, an underlying problem with the immune system.