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Veins carry blood low in oxygen content from the body to the lungs and heart. Varicose veins can lead to aching or even ulceration of the legs. Varicose veins can be caused be weakened valves in the veins or weakened walls of the veins, or by inflammation in the veins (phlebitis). Varicose veins and spider veins are not dangerous (with rare exceptions).
Varicose veins - Causes. Varicose veins are usually caused by weak vein walls and valves. Inside your veins are tiny one-way valves that open to let the blood through, and then close to prevent it flowing backwards. Sometimes the walls of the veins become stretched and lose their elasticity, causing the valves to weaken.