There are many reasons for leg swelling after lower limb varicose vein surgery. 1, there are many complications seen after lower limb varicose vein surgery, lower limb vein thrombosis also known as deep vein thrombosis. If the leg is swollen, it is necessary to exclude whether there is venous thrombosis, and it is very simple to exclude it by doing the ultrasound of the veins of the lower limbs. 2, when the varicose veins of the lower limbs are operated, basically the superficial veins are treated, and after the superficial veins are treated, the deep veins need to compensate (venous blood flow back). If the swelling is slightly in the process of activity after surgery, it may be caused by incomplete compensation or deep vein valve insufficiency, which can be solved by wearing elastic stockings and eating anti-swelling drugs. However, it is better to go to the hospital to see the doctor to give a more accurate answer.