Varicose veins are mainly confined to the lower extremities, so the edema caused by them is the edema of the lowest part of the body, that is, the edema of the ankle area, which is due to the thinning of the vein wall under the long-term high tension, and the increase of the permeability of the vein, so the fluid in the vein will leak through the vein wall to the subcutaneous, causing the edema of the subcutaneous tissue. For this kind of edema, the tension in the veins will be reabsorbed after the lower limbs are elevated and reduced, so this kind of edema will disappear after the lower limbs are elevated. For patients with varicose veins, it is recommended to elevate the legs while lying in bed, and if you want to get out of bed, it is better to wear elastic stockings to give the veins a protection. Swelling caused by varicose veins must not involve the face and upper limbs, which is different from edema caused by heart and kidney insufficiency.