Pulmonary thromboembolism, a latent that should not be ignored! Pulmonary artery thromboembolism, commonly known as pulmonary embolism, is a general term for a group of diseases whose pathogenesis is the obstruction of the pulmonary artery by various emboli, the most common embolus being thrombus. Pulmonary embolism is mainly caused by deep vein thrombosis of the lower extremities or pelvic vein thrombosis, where the thrombus is dislodged and obstructs the pulmonary artery along the refluxing vein, through the right atrium and right ventricle, resulting in pulmonary circulation and respiratory dysfunction. The “triad of pulmonary embolism”: chest pain, hemoptysis, and dyspnea; cough, syncope, and irritability may also occur. The mortality rate of acute pulmonary embolism is high, which is mainly determined by the number of blocked vessels, the speed of occurrence and the underlying state of heart and lungs. The main risk factors: long-term bedridden, lower extremity venous reflux disorder, history of deep vein embolism, deep phlebitis, after major surgery, obesity, advanced age, blood hypercoagulation state, tumor, oral contraceptive pills, etc. long lying and moving to prevent pulmonary embolism.