The most serious consequence of varicose veins is pulmonary embolism, because pulmonary embolism may endanger the life of the patient, so varicose veins must be treated in time. Because varicose veins are the result of increased venous pressure and stagnation of venous blood, in this case, venous thrombosis will form locally, especially if there is local damage, the chances of thrombosis are higher, and thrombosis of superficial veins will cause redness, swelling, pain and these sensations in patients. If left untreated, the thrombus will become bigger and bigger and enter into the deep vein through the intersection of the penetrating vein or the saphenous vein and the deep vein, forming a deep vein thrombosis, and the patient will feel swelling in the leg. If the deep vein thrombosis is dislodged, it will enter into the pulmonary artery with the blood flow, which will embolize the pulmonary artery and affect the exchange of blood and air between the lungs, and the patient will experience hypoxia, mainly manifested by cough, chest pain and impaired consciousness. So with varicose veins, it is important to treat them in time to avoid treatment after these serious consequences.