Varicose veins of the feet are caused due to prolonged standing work, high physical activity and sedentary lifestyle, and may also be caused due to deep vein thrombosis of the lower limbs, venous compression secondary to venous valve insufficiency. 1. Persistent standing work, high physical activity and sedentary: the pressure generated by the gravity of venous blood in long-term standing, high physical activity and sedentary people will act on the venous valves for a long time, and the valves will become fissured after long-term stress, and the blood will return along the fissure to the veins below, so that the pressure in the lumen of veins below will increase, which will become rounded and dilated, and varicose veins of the feet will be formed. 2. Deep vein thrombosis of the lower limbs: Deep vein thrombosis of the lower limbs can lead to the obstruction of blood return to the veins of the lower limbs, causing varicose veins of the lower limbs. 3. External venous compression: pregnancy, pelvic tumor, abdominal tumor, etc. compress the inferior vena cava, leading to obstruction of venous return channels in the lower limbs, thus causing varicose veins in the feet. The varicose veins of the lower limbs caused by pregnancy can often recover on their own. Patients with varicose veins of the feet should go to the hospital in time, under the guidance of the doctor to carry out standardized treatment.