Is the blood in your veins blue?
No — the evidence does not support this claim.
Deoxygenated blood in your veins is blue.
What the evidence shows
Human blood is always red. Oxygen-rich blood is bright cherry red and oxygen-poor blood is a darker, burgundy red — but it is never blue. Veins look bluish because of how light passes through skin: longer red wavelengths are absorbed while shorter blue-green wavelengths scatter back to the eye, creating the illusion of blue vessels.
This summary describes a fact-check originally published by Live Science. FactGuard did not conduct this review; we summarize it and link to the original. Read the original fact-check by Live Science →
Sources
- Live Science
- Hematology / optics of skin
Published 2026-06-07 · Last reviewed 2026-06-07
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