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Pulmonary embolism is mainly the corresponding clinical symptoms caused by thrombus, gas embolism or other emboli blocking the lungs. The most common clinical symptom is pulmonary thromboembolism, which is mostly caused by deep vein thrombosis of the lower extremities falling off and blocking the pulmonary artery. Patients may present with cough, expectoration, hemoptysis, and severe dyspnea. When the degree of obstruction is severe, it can cause circulatory disturbance and lead to sudden death.