Pulmonary embolism is a serious medical condition that can lead to death. Pulmonary embolism is blockage of the pulmonary artery by emboli. Dyspnea, chest pain, cough and hemoptysis are the main clinical symptoms and signs of pulmonary embolism. There are many diagnostic methods for pulmonary embolism including CT pulmonary angiography, Ventilation-Perfusion scan and Laboratory tests such as D-dimer test. Risk stratification of pulmonary embolism is an important part of management of patients with pulmonary embolism. Anticoagulants are the main treatment for pulmonary embolism. Warfarin, Heparin and NOAC (New Oral Anticoagulants) are important anticoagulants.