IntroductionNeurogenic pulmonary edema (NPE) is alife-threatening condition caused by various significant central nervous systeminjuries. It is characterized by an abrupt increase in fluids within thealveoli and interstitium of the lungs. The mechanism underlying NPE remainsunclear. Few pathophysiological causes—including neurocardiac factors,neurohemodynamic factors, blast theory, and pulmonary venule adrenergichypersensitivity—have been proposedCasereportWe report the case of a patient with NPEassociated with subarachnoid hemorrhage (SAH) and stress-hemoconcentration.Adrenergic responses have been reported to play a crucial role in both NPE andstress-hemoconcentration. We believe that SAH induces an adrenergic surge,which causes a cascade of reactions and leads to both NPE andstress-hemoconcentration.ConclusionCentral nervoussystem (CNS) injuriesare crucial and common causes of adrenergic stimulation; therefore, any subtlesigns indicating CNS injuries should be carefullyinvestigated. The distress of NPE may mask the initial symptoms of CNS injuries.If the patient is intubated and under mechanical ventilation to treat NPE, theinciting neurological injury may be overlooked and result in a delayeddiagnosis.