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What Causes Spider Veins?

December 20, 2020

<img src="vein.jpg" alt="spider veins causes and treatment"/> Medical Review By: John Koziarski, MD

 

Thin, squiggly veins that are visible through the skin can be as mystifying as they are frustrating.

What causes spider veins? While there are many risk factors, a common underlying problem is venous insufficiency. In this condition, the valves in the veins become weakened or damaged. Normally, the valves close after the vein pumps blood back to the heart. But when the valves aren’t working properly, some of the blood leaks backward and pools. This causes the vein to bulge and branch out, creating web-like or tangled spider veins. Spider veins typically affect the legs but sometimes appear on the face. They may be red, blue or purple.

“I compare the venous insufficiency to leaks that occur in an underground lawn sprinkler system that create puddles on the surface,” said John Koziarski, MD, a board-certified general/vascular surgeon at The Vein Center at Water’s Edge Dermatology. “The puddles, like spider veins, are the visible result of the leaks.”

Risk factors for spider veins

The risk factors that make someone vulnerable to spider veins include:

Aging. Veins naturally weaken over time, making spider veins more likely.

Genetics. Spider veins run in families. You may have inherited valves that are prone to weakening. While spider veins don’t occur very often in young people, family history is usually the culprit when they do. “I’ve had some patients who are as young as teenagers, and the problem is that they simply had bad veins to begin with,” Dr. Koziarski said.

Being overweight or obese. Extra weight puts more pressure on the veins and may eventually cause the valves to fail.

Pregnancy. Pregnant women are vulnerable to spider veins due to weight gain and fluctuations in estrogen and progesterone levels, which can weaken the veins. While spider veins are usually permanent, those that develop during pregnancy sometimes go away once the baby is born and hormone levels stabilize.

Standing still for long periods. The contraction of your leg muscles helps pump blood through your vessels. Standing for long periods allows blood to stagnate in the veins. Dr. Koziarski noted, “You often see spider veins in people who have jobs that require hours of standing still, such as hair dressers and assembly line workers.”

A sedentary lifestyle. Too much sitting also causes blood to stagnate. As for crossing your legs while seated, contrary to popular belief, it’s not a major contributor to spider veins, said Dr. Koziarski. It can, however, cause pain in people who already have them by reducing blood flow out of the legs.

<img src="vein.jpg" alt="spider veins causes and treatment"/> Wearing high heels. The muscles in your feet and ankles don’t contract as well when you walk in high heels. The muscle contraction is how the blood in the veins is pumped up the legs and back to the heart. Without it, the blood tends to pool in the legs.

Sun exposure. While the sun doesn’t directly cause spider veins, heating the skin causes existing veins to dilate, or get larger, to help dissipate the heat.

Injuries. It’s uncommon, but some traumas, such as being hit with a softball, can damage the veins and lead to spider veins.

Are spider veins dangerous?

Spider veins themselves are not harmful to your health. However, they may indicate that a more serious problem, such as venous insufficiency.

Spider veins can be very uncomfortable. “While some people seek treatment for them for cosmetic reasons, most want to remove them because they may itch and cause a throbbing, burning or heavy sensation,” Dr. Koziarski explained.

How to prevent spider veins

You can’t necessarily prevent spider veins, especially if they run in your family, but these measures can help you lower your risk:

  • Wear compression socks or stockings if recommended by your doctor; they help minimize the pooling of blood in the skin of the legs
  • Maintain a healthy weight
  • Exercise regularly
  • Take walking breaks if you have to stand or sit for long periods
  • Wear low-heeled shoes
  • Elevate your legs above your heart when you lie down

How to get rid of spider veins

When you consult a vein surgeon, an ultrasound will be used to identify which veins are affected. Determining the source of the leakage that may be causing the spider veins helps the surgeon decide how to treat them.

Spider vein treatment options include:

<img src="vein.jpg" alt="spider veins causes and treatment"/> Sclerotherapy. This is the most common technique for removing spider veins on the legs. The surgeon injects a solution into the vein, which irritates the inner lining and ultimately causes it to collapse. The blood then re-routes through healthier veins. The needle used is very fine, so no anesthesia is required. Usually, only one treatment is needed, though sometimes a particularly dense cluster of veins will require a second procedure. Side effects of sclerotherapy include bruising, swelling and itching. Some people may experience temporary skin discoloration (hyperpigmentation) in the injected areas.

Ultrasound-guided foam sclerotherapy. In this variation of sclerotherapy, the provider uses ultrasound to help guide him or her to the affected vein. A foam solution is then injected that destroys the inner lining of the vein. This method may be recommended for larger veins.

<img src="vein.jpg" alt="spider veins causes and treatment"/> Surface laser treatment. If your spider veins are small, the surgeon may be able to treat them using light therapy. The provider uses a device that delivers laser or intense pulsed light (IPL) through the skin, which makes the veins collapse. Only local anesthesia is required. Risks are minimal, though in rare cases the treated skin may thin and develop ulcerations. This method isn’t recommended for people with dark skin because it can lead to permanent discoloration.

Ohmic thermolysis. While this technique can be used on any area of the body, it’s often recommended for very fine spider veins on the face. A topical anesthetic may be applied to the treatment areas. The surgeon then uses a very fine needle to deliver small bursts of energy just below the skin but above the affected vein. The energy heats the vein, causing the blood to coagulate and the walls to collapse. Ohmic thermolysis has a very small risk of scarring.

With so many treatment options available, your surgeon should be able to find one that will effectively eliminate your spider veins, putting an end to any discomfort or itching they’ve caused and improving your appearance.

 

Article Written By: Jessica Brown, a health and science writer/editor based in Brooklyn, New York. Her work has appeared in Prevention, Johnson & Johnson, the Breast Cancer Research Foundation and many more.

 

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