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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).
Little valves are there to prevent back flow caused by gravity, and when these valves fail, that is what causes varicose veins. The blood backs up a bit, enlarges the vein and the bulges in the vein are where the valve tissue is. Source(s): masters in human physiology, retired AP bio and physiology teacher.