Diffuse Alveolar Hemorrhage By Joyce Lee, MD, MAS, University of Colorado School of Medicine Reviewed / Revised Sep 2021 | Modified Sep 2022 View Patient Education Pathophysiology Etiology Symptoms and Signs Diagnosis Prognosis Treatment Key Points Topic Resources Alveolar Hemorrhage Diffuse Alveolar Hemorrhage Diffuse alveolar hemorrhage is persistent or recurrent pulmonary hemorrhage.