The most serious form of dermatomyositis is severe dermatomyositis, which requires prompt medical attention. Dermatomyositis is a non-septic inflammatory disease with unclear pathogenesis and transverse muscle as the main lesion, mainly involving the skin and muscles, and damage to internal organs and muscle damage can occur, manifesting as symmetrical muscle weakness, mainly in the proximal muscle groups of the limbs, the neck and the throat muscle groups, and so on. Severe dermatomyositis patients involved in the lungs, interstitial pneumonia, if the rapid progression of interstitial pneumonia, often life-threatening; cardiac involvement will appear arrhythmia, congestive heart failure, etc.; if the pharyngeal muscle groups are involved in drinking water choking, coughing, swallowing difficulties; severe limb muscle group involvement will lead to the inability to walk. When dermatomyositis occurs, it is recommended to consult the Department of Rheumatology and Immunology of regular hospitals for treatment.