Varicose veins can occur in many parts of the body, but most commonly occur in the lower extremities. Varicose veins in the lower extremities can affect the appearance of the patient’s skin and may cause rupture and bleeding of the varicose veins, and may also cause superficial phlebitis and even secondary deep vein thrombosis, leading to pulmonary embolism and even life threatening. The main hazards of varicose veins are as follows: 1, affect the normal walking function of patients: varicose veins can cause soreness, heaviness and weakness in the affected limbs. 2, affect the beauty of the legs: the lighter ones show red blood, and the heavier ones show tortuous expansion of striped veins. If not treated in time, further development, skin pigmentation with itching, skin atrophy, can also lead to thrombotic superficial phlebitis, old rotten leg. 4, varicose vein rupture bleeding: Mostly occur in the foot and boot area and ankle, especially inadvertent scratching, can appear subcutaneous bruising or skin rupture external bleeding. 5.Deep vein thrombosis: Severe varicose veins can also cause superficial vein or even lower limb deep vein thrombosis. Deep vein thrombosis of lower limbs may lead to the risk of pulmonary embolism, and some patients with pulmonary embolism have life threatening. Although superficial varicose veins are not too dangerous, it is still dangerous if deep vein thrombosis occurs, so it is advisable to treat them as early as possible and seek medical attention in time.