A 63-year-old man presented to the emergency department with shortness of breath, chest pain, and lightheadedness. He had a history of smoking and alcohol use. On examination, he was pale, diaphoretic, and had distended jugular veins. Tests showed signs of pulmonary embolism including reduced oxygen levels and elevated D-dimer and cardiac markers. A CT scan confirmed multiple pulmonary embolisms. He was treated with oxygen supplementation, analgesics, and low molecular weight heparin to prevent further clot propagation.