Your skin scatters light. Red light penetrates deeper into your tissues, where it’s absorbed by the blood in your veins. Blue light doesn’t penetrate as deeply—it’s reflected back to your eye. So what you see is the blue light bouncing off your skin, not the actual color of your blood.
That’s why veins look bluish or greenish depending on your skin tone, the depth of the vein, and the lighting. It’s an optical illusion. A fascinating, harmless optical illusion.
Normal (Non-Dangerous) Causes of Visible Veins
Let me put your mind at ease. Most visible veins are not a medical problem. Here’s why yours might be showing.
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