Why do I get varicose and spider veins on my legs?

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Gabriel P. Lasala, MD
Interventional Cardiology
Varicose veins often occur in the legs because the force of gravity makes it harder for the leg veins to pump blood back up toward the heart compared to other areas of the body such as arms and face.
The reason that varicose veins typically occur in the feet and legs is a matter of physics. Gravity is constantly pulling you downward, and weight puts pressure on your legs and feet. For this reason, your circulatory system works hard to push the blood back up to your heart which can create changes in your veins which lead to varicose veins.
Piedmont Heart Institute
Administration
The force of gravity, the pressure of body weight, and the task of carrying blood from the bottom of the body up to the heart make legs the primary location for varicose and spider veins. Compared with other veins in the body, leg veins have the toughest job of carrying blood back to the heart. They endure the most pressure. This pressure can be stronger than the veins' one-way valves.

This answer is based on source information from The National Women's Health Information Center.
Dr. Ellen Marmur, MD
Dermatology
This is a circulation problem stemming from incompetent valves in the vessels. These valves are supposed to prevent the backflow of blood, helping it move back up toward the brain -- no easy feat considering the distance from your legs to your head and the downward pull of gravity. When they're working properly, the valves prevent blood from rushing down to the feet (another brilliant engineering facet of the body). People with varicose veins have "floppy valves" that don't open and close effectively, which causes blood to flood these leg vessels. The condition definitely worsens in pregnancy, perhaps because the blood flow doubles at that time.

This circulatory condition is partially genetic, but it can occur as a result of physical trauma too. I got my spider veins and varicose veins after a bad bicycle accident compressed my leg. In my situation, I think genetics has played a part too, and my varicose veins did get worse during my pregnancies.
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What if a leading dermatologist just happened to be your best friend and you could ask her anything? DR. ELLEN MARMUR, a world-renowned New York City dermatologist, answers all your questions with...

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Spider Veins and Varicose Veins

Large twisted blue or purplish veins visible at the skins surface are known as varicose veins. Any vein in your body can become varicose but it usually occurs in the legs and feet due to the pressure the lower body endures to keep ...

your body upright. It is caused by the weakening of the valves and veins in your legs. Varicose veins are usually hereditary. We are also more prone to get varicose veins as we age. Symptoms include itching, burning, throbbing or cramping in the legs and around the veins. Self-care measures such as exercising, elevating your legs, and wearing compression stockings are used to ease the pain and prevent varicose veins from getting worse. If these measures dont work, see your doctor to discuss medical treatments that are available to close or remove varicose veins.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.