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Why do we yawn?

Dr. Michael Roizen, MD
Internal Medicine
Fatigue is part of why we yawn. But the technical reason is that people yawn because your body senses a dip in oxygen in the blood, so your body wants to yawn to take in more oxygen and get it back into the bloodstream. We still don't understand why yawning is contagious, however.
YOU: The Owner's Manual, Updated and Expanded Edition: An Insider's Guide to the Body that Will Make You Healthier and Younger

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YOU: The Owner's Manual, Updated and Expanded Edition: An Insider's Guide to the Body that Will Make You Healthier and Younger

Between your full-length mirror and high-school biology class, you probably think you know a lot about the human body. While it's true that we live in an age when we're as obsessed with our bodies as...

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.