Women develop spider veins nearly four times as frequently as men. In fact, about 70 percent of adult women are afflicted with spider veins at some time in their lives. Some women are at greater risk due to heredity factors; others are predisposed to spider veins because of lifestyle. Women who are pregnant or use oral contraceptives are at risk, as are women who experience an increase in estrogen, which is said to weaken the vein wall. Overweight women are prone to this condition because they are more likely to develop circulatory problems, diabetes and heart disease, all of which hinder the flow of blood from the veins to the heart. Standing for prolonged periods of time increases the risk since it's harder for veins to fight gravity in carrying blood to the heart. Those who wear high-heeled shoes can stress leg veins by forcing calf muscle into prolonged contraction.
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