VTE is the medical term for venous thromboembolism, mainly due to slow venous blood flow, venous vascular injury, and increased coagulation of blood, which causes abnormal blood clotting in the veins, complete or partial obstruction of the venous vessels, and even the formation of thrombosis. It is commonly seen in lower extremity deep vein thrombosis and pulmonary embolism. In the case of patients with lower extremity DVT, there may be pain, edema and heaviness in the lower extremities, and even bruising. Patients with pulmonary embolism may experience dyspnea, chest pain, hemoptysis, cyanosis, and tachycardia. It is recommended to seek medical attention in time to clarify the diagnosis through ultrasound, venography and other related tests. Common treatment methods for VTE are as follows: 1. Anticoagulation therapy: you can inject common heparin intravenously or subcutaneously, or take long-term anticoagulant drugs such as warfarin orally; 2. Thrombolysis therapy: usually take medication, commonly used drugs include urokinase, recombinant human tissue fibrinogen activator. Thrombolytic therapy should be accompanied by intravenous heparin anticoagulation; 3. Surgical treatment: Thrombectomy is mainly applied to patients with severe lower extremity deep vein embolism, such as femoral cyanosis, femoral leukomalacia or acute iliac-femoral vein thrombosis. After embolization, anticoagulation should still be actively administered and medication should be taken as prescribed by the doctor; 4. Other: If anticoagulation is contraindicated or if thrombosis occurs again on the basis of anticoagulation, placement of a vena cava filter is recommended for treatment.