Venous thrombosis in the left leg mainly includes deep vein thrombosis and superficial vein thrombosis in the left leg. Superficial vein thrombosis is mostly due to thrombo-occlusive phlebitis brought about by varicose veins in the lower extremities. Local acute inflammatory manifestations such as redness, swelling, heat and pain can be formed, and the inflammation usually subsides after 1-2 weeks and slowly eases or even recovers completely. If you want to eradicate superficial venous thrombosis, you must undergo surgical treatment to lift the varicose veins. After the varicose veins are cured surgically, the superficial vein thrombosis can also be completely recovered. Deep vein thrombosis in the left leg needs to be evaluated for full recovery depending on its condition and severity. If treated promptly with regular anticoagulation, thrombolysis, and a full course of treatment, most venous thrombosis can be fully recovered. Some patients with venous thrombosis can also recover by establishing collateral circulation and resume normal school, work and life. A small percentage of severe venous thrombosis, if not treated promptly, can leave serious sequelae of venous thrombosis such as post-thrombotic syndrome. If venous thrombosis is formed, timely and systematic treatment in specialized vascular surgery is also required.