Pulmonary embolism (PE) is a common clinical disorder associated with high morbidity and mortality. PE occurs when deep vein thrombi detach and embolize to the pulmonary circulation, obstructing blood flow and impairing gas exchange. Clinical presentation of PE is variable but often includes dyspnea, tachypnea, tachycardia, and pleuritic chest pain. Diagnosis involves assessment of clinical probability, d-dimer testing, imaging studies like CT pulmonary angiography, ventilation-perfusion scanning, echocardiography and assessment of right ventricular function. Prompt diagnosis and treatment are important to prevent complications including right heart failure and death.