what color is your blood inside your body

Your blood is always red inside your body, not blue.

Quick Scoop: What color is your blood?

• Inside your body, human blood is various shades of red , from bright red to dark, almost maroon red.

• It is never naturally blue in humans; that’s a common myth.

• The shade depends on how much oxygen the blood is carrying, not on whether it’s “inside” or “outside” your body.

People often say: “Blood is blue in your veins and turns red when it hits the air.”
Reality: It’s red the whole time; your eyes are being tricked.

Why your blood is red

• Blood contains red blood cells that are packed with a protein called hemoglobin.

• Hemoglobin has iron in it; when iron binds oxygen, it gives blood a red color.

• Oxygen-rich (arterial) blood is bright, cherry red.

• Oxygen-poor (venous) blood is darker, more like brick or burgundy red, but still red.

A simple example:

• Blood coming from your lungs to the rest of your body: bright red.
• Blood returning from your body back to your heart and lungs: darker red.

So why do veins look blue?

• Veins look blue under your skin because of how light passes through skin and is reflected back, not because the blood is actually blue.

• Skin and tissue absorb and scatter different wavelengths of light; more red light is absorbed, so the remaining reflected light can make veins appear bluish.

• If you draw blood from a vein into a tube with no air, it still looks dark red, not blue.

Are there any exceptions?

For humans:

• Under normal conditions, all blood is some shade of red.

• Rarely, certain medical conditions and drugs can tint blood unusual colors (for example, green in very rare sulfhemoglobinemia), but this is not normal and is usually linked to illness or medications.

For other animals:

• Some animals do have non‑red blood because they use different oxygen-carrying molecules:
  • Horseshoe crabs and some other invertebrates use copper-based hemocyanin and have blue blood.

* Some lizards have green blood due to high levels of bile pigments.

TL;DR

• What color is your blood inside your body?
  → Red, ranging from bright red to dark red.

• Is it ever blue in humans?
  → No, that’s a visual illusion plus a long‑standing myth.

Information gathered from public forums or data available on the internet and portrayed here.