Diffuse alveolar hemorrhage (DAH) is an acute, lifethreatening syndrome with clinical manifestations characterized by hemoptysis, dyspnea, reduced hemoglobin, and diffuse radiographic pulmonary infiltrations. The histopathology of DAH involves the accumulation of intra-alveolar red blood cells (RBCs) originating from the alveolar capillaries [1]. A broad spectrum of disorders, including immune-mediated diseases, infections, malignancies, and drugs, are all the possible underlying etiologies of DAH. The most common clinical causes of DAH include small vessel vasculitis, known as antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV), followed by Goodpasture syndrome and other collagen vascular diseases [1,2].Vasculitis-associated DAH typically presents with acute/ fulminant course and generally demonstrates high morbidity and substantial mortality [3,4]. Therefore, prompt diagnosis and aggressive treatment are required to improve survival. Recognition of vasculitis-associated DAH depends on the awareness of clinicians; once the diagnosis is established, the underlying etiology must be investigated to initiate proper management. Delayed diagnosis and insufficient treatment for the early stages of vasculitis-related