Body composition can also affect how visible veins are.
Study Anatomy
When someone has a relatively low percentage of body fat, there is less tissue between the skin and superficial veins. As a result, veins can become much easier to see.
This is particularly noticeable in people who exercise frequently or have lost a significant amount of weight. (Cleveland Clinic)
That means visible veins are not automatically a sign that something is wrong.
In some people, they are simply a consequence of having less subcutaneous fat.
3. Exercise Can Temporarily Make Veins Bulge
Have you ever noticed your veins becoming much more prominent after exercising?
Book Workouts
That’s also normal.
During physical activity, blood flow increases. Exercise—particularly resistance training—can temporarily make superficial veins appear larger and more obvious. Building muscle can also push superficial veins closer to the skin.
You may therefore notice very visible veins:
After lifting weights
After doing push-ups
After intense exercise
During hot weather
After strenuous physical work
They may become much less noticeable once your body returns to its resting state.
