Pulmonary embolism is an emergency in clinical settings, with rapid progression and extreme danger, and is generally treated by the department of respiratory medicine. Pulmonary embolism primarily occurs due to dislodged blood clots that block the pulmonary artery and its branches, leading to pulmonary infarction. The clinical manifestations of pulmonary embolism mainly include severe breathing difficulties, chest pain, coughing up blood, and even circulatory disturbances. After a pulmonary embolism occurs, a pulmonary artery CT scan can be used to further confirm the diagnosis. Treatment options may include thrombolysis, and possibly anticoagulation therapy with low molecular weight heparin or warfarin. (Specific medications should be used under the guidance of a physician.)