Why do vein

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Varicose and spider veins: Varicose veins are enlarged veins that often twist and can bulge above the surface of the skin. They may be blue, red, or flesh-colored. Spider veins often look like webs. Having spider or varicose veins can affect more than your appearance. These veins can cause serious discomfort. Some varicose veins put you at risk for a complication like a blood clot or open sores on your legs.

Minimally invasive treatment can get rid of or fade leg veins. Treatment can also diminish symptoms like pain and fatigue and prevent complications. Varicose and spider veins are damaged veins.

We develop them when tiny, one-way valves inside the veins weaken. In healthy veins, these valves push blood in one direction — back to our heart.

When these valves weaken, some blood flows backward and accumulates in the vein. Extra blood in the vein puts pressure on the walls of the vein. With continual pressure, the vein walls weaken and bulge. In time, we see a varicose or spider vein. Some people have a higher risk of developing these veins. If blood relatives have them, you have a higher risk. Many people get them because they sit or stand for long periods most days of the week.

Accessed Dec. Varicose veins. National Heart, Lung, and Blood Institute. Mayo Clinic; Varicose veins and spider veins. National Women's Health Information Center. Kabnick LS, et al. Overview of lower extremity chronic venous disease. Kang S, et al. Treatment for varicose and telangiectatic lower extremity vessels.

In: Fitzpatrick's Dermatology. Natural Medicines. Sweet clover. Horse chestnut. Butcher's broom. Alguire PC, et al. Medical management of lower extremity chronic venous disease. Riggin EA. AllScripts EPSi. Mayo Clinic, Dec. You have veins and arteries running through your whole body. They are tiny tubes that carry blood to and from every part of your body, from your nose down to your toes. The flow of blood starts with the pumping action of your heart. When your heart beats, it pumps your blood and moves it through all those little tubes.

The arteries carry the blood from your heart out to your body, and the veins carry the blood from your body back to your heart. The blood going out to your body in the arteries is full of oxygen, which makes the blood bright red. But the blood coming back from your body in the veins is darker because your body parts have used up the oxygen in the blood.

That's why veins look purple or blue. It's a lot of work to move all that blood. To do their job, veins are full of valves that help keep the blood flowing in the right direction. Valves are like tiny doors that close after the blood has passed through to keep blood moving along and to make sure it doesn't flow backward. As people get older, though, the valves might not work as well.

When that happens, some blood can stay in a vein instead of moving forward like it should. This makes the vein swell, and that swollen vein is a varicose vein. The veins often show up on the legs, ankles, and feet because those body parts are farthest from the heart. Gravity pulls blood down into your legs and feet when you're standing up or sitting down.