Complications of varicose veins of the lower extremities mainly include edema of the lower extremities, ulcer formation, and rupture of blood vessels. 1. Lower extremity edema. Clinically, varicose veins are mainly caused by venous reflux, venous return obstruction, congenital developmental abnormalities and other factors. With the progress of the disease, the superficial varicose veins of the lower limbs continue to aggravate, which will cause heaviness of the lower limbs, soreness and discomfort, and in severe cases, edema of the lower limbs will occur, especially after the activity will make the edema aggravate. 2. Ulcer formation. Often due to varicose veins of the lower limbs, it will cause damage to the function of the venous valves, making the blood stasis worse, and even the formation of blood clots, resulting in itching and eczema, and also cause localized breakouts, which can lead to the formation of ulcers. Some patients may also be combined with infection, which will not heal for a long time. 3. Vascular rupture. Usually, varicose veins increase the brittleness of the veins and may rupture due to slight collision or friction. Secondly, the pressure inside the varicose vein is high and when it ruptures, it causes bleeding at a faster rate, so it should be wrapped with a towel with pressure in time and should be treated by a doctor in time. Usually, after the occurrence of varicose veins, it is recommended to consult a doctor for timely treatment.