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Most of the time, prominent veins in the hands at a young age are a common, harmless variation produced by variables such as little body fat, heredity, or a fair complexion. While large hand veins are frequently linked with age, they can also be quite normal in young, healthy persons.
Common and harmless causes
Low body fat: The hands naturally have less fatty tissue than the rest of the body. For young people who are very slim, the lack of fat cushioning causes veins to look more visible and closer to the skin’s surface.
Thin or fair skin: If you have thin or light-toned skin, there is less skin pigment (melanin) and tissue to hide veins. The veins may seem blue or dark purple, as is common for venous blood.
Genetics: If your parents or other close relatives have visible hand veins, you are more likely to have them, too. The inclination for prominent veins is frequently hereditary.
Exercise and physical activity: The muscles in your hands and arms receive more bl00d flow during and after exercise. This causes veins to enlarge and become more apparent, a phenomenon known as vascularity. This is particularly common among weightlifters.
Hot weather: causes your veins to dilate and expand, allowing your body to cool itself by boosting blood flow to the skin’s surface. This makes the veins more visible until your body temperature stabilizes.
Hormonal changes: Normal hormonal fluctuations, such as during puberty, can temporarily cause veins to look more visible.
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