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Spider veins and varicose veins are caused by structural abnormalities of blood vessels. Veins carry blood back to the heart from other parts of the body. They utilize a series of one-way valves to avoid backflow of blood.
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.