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The blood inside your veins is dark red. So, many people wonder why veins look green or blue through the skin instead of red.

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Veins are types of blood vessels. The other blood vessel types are capillaries and arteries. Blood vessels help transport blood and nutrients throughout your body. The job of most veins is to carry oxygen-depleted blood from bodily tissues back to your heart. Your pulmonary artery brings your blood to your lungs, where it receives a fresh supply of oxygen.

Your arteries then carry the oxygenated blood to your tissues and organs. There are three types of veins: deep veins, pulmonary veins, and superficial veins. Superficial veins are the type that you can see. They may look green instead of red because the color green has a shorter wavelength than the color red. They may also look blue or blueish-green because blue also has a shorter wavelength than red.

The electromagnetic spectrum contains wavelengths, or visible light that your eye can see. The colors of visible light range from red to violet in this order: red, orange, yellow, green, blue, violet. Red has the longest wavelength, lowest frequency, and least amount of energy.

For instance, a green leaf reflects the green waves and absorbs the other colors, which is why we see it as green. Green and blue veins can also be seen where your skin is thin. Skin can become thinner and less elastic with age, making veins appear more prominent.

Also, the less fat you have, the more your veins may show, regardless of your age. Here are some other reasons why veins may appear more prominent :. Varicose veins are caused by a malfunction in your one-way valves that stop blood from flowing through your veins backward. Varicose veins often appear on your lower legs. They may look like zigzags, and take on one of the following colors:. Pregnant people and people over 50 ased female at birth may be more likely to get varicose veins. People with obesity may also be prone to this condition.

They appear as tiny, threadlike red or discolored lines under your skin, in areas such as your:. They may indicate a serious underlying condition, such as alcohol use disorder. Pregnancy can also cause spider veins. Superficial thrombophlebitis is an inflammatory, short-term condition caused by a blood clot under your skin. Superficial thrombophlebitis is often caused by insertion of an intravenous IV needle.

It may also result from varicose veins. Since it occasionally le to a serious condition called deep vein thrombosisyou should always call a doctor if you suspect you have superficial thrombophlebitis. Green veins are superficial veins located near the surface of your skin. They appear green instead of red because green has a shorter wavelength than red. If you have darker skin, it can be harder to see the color of your veins.

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They can diagnose and recommend treatment for any vein-related conditions you may have. Learn more. Mesenteric artery ischemia is a condition that restricts blood flow to your intestines.

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Find out what causes it and how to treat it. Elevating your legs can have several potential health benefits.

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It can improve blood flow, reduce inflammation, and lower pressure in the veins in…. The lateral femoral circumflex artery supplies oxygenated blood to the anterior front and middle portions of the thigh muscles. It typically…. Now, the Delta variant is affecting many unvaccinated people, like children…. Why Are My Veins Green? Medically reviewed by Alana Biggers, M. Why do veins look green? Where on the body are veins most visible? Are green veins something to be concerned about? Read this next.

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All About Reticular Veins. Mesenteric Artery Ischemia Mesenteric artery ischemia is a condition that restricts blood flow to your intestines. Medically reviewed by Angela M. Lateral femoral circumflex artery Medically reviewed by the Healthline Medical Network.

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