Why Do Veins Suddenly Show Up? Veins may become more noticeable for a number of reasons: Low Body Fat: Veins become more noticeable as the layer of fat that often conceals them thins, particularly in the limbs or torso.Exercise & Weight Lifting: Increased blood flow during exercise can cause veins to enlarge and become more pronounced. Regular training causes muscles to expand over time, which forces the veins closer to the surface.Hot Weather: As the body attempts to cool itself, warm temperatures cause veins to dilate, or widen. They may become more noticeable as a result of this transient alteration,...
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