what causes ppl to have noticeable blue vains??

Answer 1

They are called vericose veins. Here is some info on them...

Varicose veins are gnarled, enlarged veins. The word varicose comes from the Latin root varix, which means "twisted." Any vein may become varicose, but the veins most commonly affected are those in your legs and feet. That's because you stand and walk upright, which increases the pressure in the veins in your lower body.

For many people, varicose veins and spider veins — a common, mild and medically insignificant variation of varicose veins — are simply a cosmetic concern. For other people, varicose veins can cause aching pain and discomfort. Sometimes the condition leads to more serious problems. Varicose veins may also signal a higher risk of other disorders of the circulatory system.

Varicose veins are a common condition in the United States, affecting up to 60 percent of all Americans. Women, especially older women, are more likely than men are to have this problem. Treatment may involve self-help measures, or procedures by your doctor to close or remove veins.

Signs and symptoms
Signs and symptoms of varicose veins may include:

An achy or heavy feeling in your legs, and burning, throbbing, muscle cramping and swelling in your lower legs. Prolonged sitting or standing tends to make your legs feel worse.
Itching around one or more of your veins.
Skin ulcers near your ankle, which represent a severe form of vascular disease and require immediate attention.
Varicose veins are dark purple or blue in color and may appear twisted and bulging — like cords. They commonly appear on the backs of the calves or on the inside of the legs. But, they can form anywhere on your legs, from your groin to your ankle.

Spider veins are similar to varicose veins, but they're smaller. Spider veins are found closer to the skin's surface and are often red or blue. They occur on the legs, but can also be found on the face. Spider veins vary in size and often look like a spider's web or a tree branch.

Other types of varicose veins include:

Venous lakes. These are pools of blood in the veins, often found on the face and neck.
Reticular veins. These flat, blue veins under the skin often appear behind the knee.
Telangiectases. These are fine clusters of blood vessels similar to spider veins, reddish in color and often found on the face or upper body.
Occasionally, veins deep within the legs become enlarged. In such cases, the affected leg may swell considerably. Any sudden leg swelling that may or may not be accompanied by pain and redness warrants urgent medical attention, as it may indicate a blood clot — a condition known medically as thrombophlebitis.

Causes

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Varicose veins
Arteries carry blood from your heart to the rest of your tissues. Veins return blood from the rest of your body to your heart, so the blood can be recirculated. To return blood to your heart, the veins in your legs must work against gravity. Muscle contractions in your lower legs act as pumps, while toned, elastic vein walls help blood return to your heart. Tiny one-way valves in your veins open as blood flows toward your heart then close to stop blood from flowing backward.

Varicose veins occur when the valves in your veins malfunction. As you get older your veins can lose elasticity, causing them to stretch. When this happens, blood that should be moving toward your heart may flow backward. Blood pools in your veins, and your veins enlarge and become varicose. The veins appear blue because they contain deoxygenated blood, which is in the process of being recirculated.

Some pregnant women develop varicose veins. Pregnancy increases the volume of blood in your body, but decreases the flow of blood from your legs to your pelvis. This circulatory change is designed to support the growing fetus, but it can produce an unfortunate side effect — enlarged veins in your legs. Varicose veins may surface for the first time or may worsen during late pregnancy, when your uterus exerts greater pressure on the veins in your legs. Hemorrhoids are varicose veins located in and around the anus.

Risk factors
These factors increase your risk of developing varicose veins:

Age. Aging causes wear and tear on the valves in your veins that help regulate blood flow. Eventually, that wear causes the valves to malfunction.
Sex. Women are more likely than men are to develop the condition. Hormonal changes during pregnancy, premenstruation or menopause may be a factor. Female hormones tend to relax vein walls. Taking hormone replacement therapy or birth control pills may increase your risk of varicose veins.
Genetics. If other family members had varicose veins, there's a greater chance you will too.
Obesity. Being overweight puts added pressure on your veins.
Standing for long periods of time. Your blood doesn't flow as well if you're in the same position for long periods.

When to seek medical advice
Self-help measures can help you ease the pain of varicose veins and may prevent them from getting worse. But if you're concerned about how your veins look and feel and self-care measures haven't stopped your condition from getting worse, see your doctor.

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Answer 2

Your genes have a lot to do with it. Do other members of your family, particularly older ones, have noticeable blue veins? Sometimes certain jobs can cause veins to become worse ... i.e. someone who is on their feet a lot, like a hairdresser, may suffer from pronounced veins in the legs (varicose veins) later on, particularly if there is already a tendency in their family for varicose veins.

If you are concerned you may have noticeable blue veins, beyond what is normal in your family, then ask your doctor about them.

Answer 3

Thin areas of skin, or varicose veins.

Answer 4

blue veins? probably pulmonmary veins

Answer 5

getting old