Outdated Medical Advice Medicine
BUSTED Comprehensively false

Blood is blue inside your body and red when exposed to air

Blood is always red; oxygen changes shade but not base colour

✗ The myth everyone repeats

Blood appears blue when inside your body and only turns red when exposed to oxygen.

✓ What is actually true

Blood is red whether oxygenated or not. Oxygenated hemoglobin is bright red; deoxygenated is dark red. Veins appear blue due to skin filtering light wavelengths, not the blood colour. Blood is never actually blue.

Believed 1900–2010
Year Revised 2005
Why Changed Never True
Confidence Fully Debunked
Region Worldwide

Reception

8/10
7/10
The receipts 2 sources
  1. Blood Color and OxygenPRIMARY
  2. Hemoglobin Oxygen BindingREFERENCE

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