Common clinical symptoms of pulmonary embolism include dyspnea, chest pain and hemoptysis, which may be accompanied by fever, excessive sweating, rapid heartbeat, dizziness, etc. Patients can initially suspect that they are suffering from pulmonary embolism through the above symptoms, but cannot diagnose it on their own, and if they have any of the above symptoms, they need to go to the hospital for further examination in a timely manner to clarify. When patients have dyspnea and other common clinical symptoms of pulmonary embolism, they need to go to the hospital in time for CT pulmonary arteriography, radionuclide pulmonary ventilation/perfusion imaging, magnetic resonance imaging and magnetic resonance pulmonary arteriography to clarify the diagnosis, and the diagnosis can be confirmed if one of the test results is positive. Pulmonary embolism is a group of diseases or clinical syndromes caused by endogenous or exogenous emboli blocking the pulmonary artery or its branches, resulting in dysfunction of the pulmonary circulation and the right heart. It is recommended that patients need to go to the hospital for relevant examinations and diagnosis if they need to confirm the diagnosis of pulmonary embolism, and if the diagnosis of pulmonary embolism is confirmed, they need to actively cooperate with the doctor’s treatment.