The underlying cause of<unk>  is unknown. It most likely has a genetic component, as other autoimmune disease tend to run in the families of patients. The disease is usually triggered by a condition that causes immune system activity that does not stop as it should, but the trigger is almost certainly not the cause in most cases. Common triggers include immunizations, infections, injuries, and sunburn.
Juvenile dermatomyositis
Dermatomyositis
Scleromyositis
Pyomyositis
Dermatopolymyositis
Inclusion body myositis
Hereditary neuralgic amyotrophy
Polymyositis