Varicose veins in the lower extremities are a common disease and need to be treated surgically in severe cases. The most common surgical procedure is “high saphenous vein ligation”, based on which laser, stripping and sclerotherapy injections are used to remove the varicose veins. Before the surgery, patients often worry about one question: the blood flow in the lower extremities depends on both deep and superficial veins working together, if the superficial veins are ligated, then all the blood flow will depend on the deep veins, will it increase the burden on the deep veins and over time, will it cause lesions in the deep veins? Let’s compare the two sets of veins in the lower limbs as two workers, they form a working group together, the deep vein is worker A and the superficial vein is worker B. The two of them work as a team every day. Their daily work is one: to transport the blood from the lower extremities back to the heart, and we compare this work to “carrying boxes”. Under normal circumstances, A (deep vein) needs to move 8 boxes every day, B (superficial vein) needs to move 2 boxes, and the two people finish moving 10 boxes even if the task is completed. However, when the superficial vein (worker B) has lesions, that is, varicose veins, the daily work of the two workers changes: every day, A still moves 8 boxes, B still moves 2 boxes, but B also does a bad thing at the same time – the boxes that have been moved out, and secretly moved back (reflux), the more serious varicose veins, B is. The more serious varicose veins, the more bad things B do, at first is to move back one or two boxes, and then gradually developed into moving back a large number of boxes, these moved back the boxes, are to rely on the deep veins (workers A) one by one to move away again, so that the continuation of the two evils: 1, the house box every day there is a backlog, that is, the appearance of venous stasis, the patient will feel sore and heavy lower limbs; 2, obviously, A’s burden is obviously aggravated than before, the more bad things B does, the heavier A’s burden is, over time, A is tired of disease, that is to say: the more serious the lesion of superficial vein, the heavier the burden of deep vein, superficial vein lesion, if not treated in time, will drag down the deep vein. At this time, if the lesion of superficial vein is treated in time and the superficial vein is ligated, that is, B is “confined”, what will be the result? At this time, B can’t work because he is confined, but he can’t do bad things, all the boxes (10) are carried by A. On the surface, A’s workload is two boxes more than normal, but, in fact, because there is no B to mess up, A can easily finish the work without adding extra workload, that is, the timely treatment of the superficial vein lesion not only does not increase the burden of deep veins, but also reduces the burden of deep veins. vein, instead, it is relieving the burden of the deep vein, and in the long run, it is protecting the deep vein. Therefore, when superficial venous lesions (reflux) are already severe, patients can safely opt for ligation without worrying about the burden on the deep veins.