Pulmonary edema and anasarca are both common findings in patients presenting to emergency departments (ED). The differential diagnosis for these conditions is very wide and requires an initially broad approach that considers multiple organ systems. Insulin edema has been previously described in multiple case reports as a likely cause of acutely developing edema in mostly type I diabetics either initiating or increasing the intensity of their insulin regimens. This case report describes a 19-year-old female with history of type I diabetes mellitus recently admitted to the hospital for diabetic ketoacidosis (DKA) presenting to a pediatric emergency department (ED) with dyspnea and weight gain. The patient had been reportedly poorly compliant on her insulin therapy before her last admission for DKA and had strictly begun to adhere to her insulin therapy in the interim. Her clinical presentation was notable for hypoxia requiring supplemental oxygen, bilateral lower extremity pitting edema, weight gain of 30 kg since discharge 9 days ago, a chest Xray displaying bilateral pulmonary edema and a work-up otherwise unrevealing for cardiac, renal, or liver etiologies. She was then admitted to the Pediatric Intensive Care Unit (PICU) on supplemental oxygen where through further evaluation she was determined to have insulin edema. This case details an unlikely etiology of anasarca and pulmonary edema, however diagnosing this condition highlights the broad diagnostic process that must be considered for any patient without known significant cardiac, renal, or liver history presenting with respiratory distress and anasarca especially on initial presentation to an emergency department.