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.
