The causes of varicose veins are varied and are related to reflux disease at the saphenofemoral juntion (venous reflux disease) or perforators at the thigh, knee or ankle. Venous reflux disease causing varicose veins can be treated using vein stripping or radiofrequency closure.
However, the etiology contributing to the development of spider veins are multiple and include heredity, pregnancy, hormonal factors, weight gain and occupations that necessitate prolonged sitting or standing.
Spider veins are less than 1 mm in diameter. Reticular veins are 1 mm to 3 mm in diameter.