When a venous thrombosis forms in the leg, vascular surgery is recommended. Three factors of venous thrombosis, including hemodynamic changes, vessel wall damage, and hypercoagulable state, can cause venous thrombosis in the legs if there is a problem in any of the causes. The biggest risk of lower limb deep vein thrombosis is the formation of lethal pulmonary tethering by thrombus dislodgement, so for the lower limb deep vein thrombosis after formation, anticoagulation treatment is the first, which can prevent further spread of thrombus, and you can take Chinese medicine to improve venous reflux, such as Mai Zhi Ling, and wear medical elastic stockings for lower limb treatment. When the thrombus develops progressively, surgical treatment is recommended, including vena cava filter implantation, thrombus aspiration and thrombus fragmentation treatment, etc.