Venous thrombosis of the left lower extremity includes thrombosis of superficial veins and deep veins, which will be treated with medication, anticoagulation and surgery according to the site of thrombosis. 1. Superficial vein thrombosis: if the superficial vein thrombosis has not yet spread to the deep vein, it can be treated by applying medication or taking oral medication to activate blood circulation and eliminate blood stasis (to promote blood circulation and eliminate blood stasis in the body) under the guidance of the doctor, e.g., enteric-coated tablets of aspirin; if the superficial vein thrombosis spreads to the deep vein, and the persistent pain can not be relieved, the thrombosis can be removed by surgery. 2. Deep vein thrombosis: general treatment measures include bed rest, elevation of the affected limb to reduce swelling, avoiding massage and squeezing; anticoagulation and thrombolytic therapy are the main treatments, including low molecular heparin, urokinase, etc.; surgical treatment is needed when the patient develops bruising and swelling of the lower limbs, for example, deep vein catheter thrombolytic surgery. The use of drugs should be in accordance with the doctor’s prescription. When the body appears left lower limb thrombosis, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.