Diffuse alveolar hemorrhage syndrome is a serious and often life-threatening disease with symptoms such as chills, fever, cough, chest pain, and dyspnea, in addition to coughing up blood. The diagnosis of this disease often relies on clinical manifestations and relevant immunoserological tests, and even a surgical lung biopsy is required for a definitive diagnosis if the diagnosis is not confirmed. Treatment should be based on the characteristics of the specific disease to give relevant treatment, hormones are often the key drugs for the treatment of this disease, the prognosis of some patients with this disease is okay, most of the prognosis is poor.