Pulmonary thromboembolism, or PTE, is the most common type of pulmonary embolism, and the symptoms of PTE are varied and lack specificity. It can range from asymptomatic and insidious to hemodynamic instability or even sudden death. Once detected, prompt therapeutic measures are required. Pulmonary thromboembolism (PTE) is the most common type of pulmonary embolism and is a disease characterized by pulmonary circulation and respiratory dysfunction as the main clinical and pathophysiological features caused by obstruction of the pulmonary arteries or their branches by a thrombus from the venous system or the right heart. Symptoms of PTE are varied and lack specificity. They can range from asymptomatic and insidious to hemodynamic instability or even sudden death. Common symptoms include unexplained shortness of breath, dyspnea, and chest pain. Clinical treatment is mainly general management and respiratory circulatory support therapy, but can also be treated with anticoagulant drugs under the guidance of the doctor, such as ordinary heparin, low molecular weight heparin, sodium sulfadiazine heparin, warfarin and so on. Severe pulmonary embolism also requires thrombolytic therapy. Once the diagnosis is confirmed, timely measures need to be taken for treatment.