Varicose veins and venous thrombosis are both venous diseases, and they are related to each other, but there are also great differences. First, there is a difference between the two locations, varicose veins generally refer to superficial veins, such as saphenous vein, small saphenous vein, etc., while venous thrombosis can be superficial or deep veins, most venous thrombosis clinically refers to deep vein thrombosis. Second, is the difference of the degree of disease, varicose veins are less severe, deep vein thrombosis is more severe. Third, the difference of treatment, once varicose veins are formed, surgical treatment, compression therapy, medication, etc., and once the venous thrombosis is formed, long-term anticoagulation therapy is required. In case of superficial vein thrombosis caused by varicose veins, surgical operation can be performed after a period of anticoagulation therapy.