why can i see my veins through my skin

The main reasons veins are visible through the skin include having low subcutaneous fat, which makes veins closer to the surface; having fair or thin skin, which is more translucent and allows veins to show through; and factors like age, genetics, and exercise. When the body is warm or during physical activity, blood vessels dilate and blood flow increases, making veins more apparent. Hormonal changes, hydration levels, and sun exposure can also affect vein visibility. Generally, visible veins are normal and related to skin type, body composition, and environmental factors, though sudden changes or accompanying symptoms may warrant medical attention.