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This causes the veins to swell, which can lead to varicose veins. Many factors can raise your risk for varicose veins. Examples of these factors include family history, older age, gender, pregnancy, overweight or obesity, lack of movement, and leg trauma.
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.