What Is the Vagus Nerve?
The vagus nerve is the longest cranial nerve, connecting the brain to the heart, lungs, gut, and other organs. It carries most of the body's parasympathetic 'rest and digest' signals and plays a major role in calming the nervous system after stress.
The vagus nerve is a major nerve connecting brain and body, central to parasympathetic ('rest and digest') activity. Educational overview.
Key takeaways
- The vagus nerve is central to calm.
- Vagal tone can be supported through specific practices.
- It links mental and physical health.
- It is studied in depression, anxiety, and PTSD.
Detailed Explanation
Roughly 80% of vagal fibers carry information from the body to the brain. Higher 'vagal tone' (often measured by heart rate variability) is associated with better emotion regulation and physical health. Slow breathing, humming, cold exposure to the face, and certain neck stretches modestly support vagal activity.
Related on Beiing
- Knowledge Center
- Vagus Nerve Exercises Guide
- Mental Wellness Assessment - Free 2-minute educational self-assessment
- Mental Health Glossary - 300+ plain-language definitions
- Editorial Standards - How our content is researched and reviewed
Sources
- National Institute of Mental Health (NIMH) - U.S. Department of Health & Human Services
- American Psychological Association - APA
- Harvard Health Publishing - Harvard Medical School
- Cleveland Clinic - Health Library - Cleveland Clinic
- Mayo Clinic - Diseases & Conditions - Mayo Clinic
Written by Beiing Editorial Team · Editorially reviewed by Research Desk · Published · Last reviewed . Editorial and research review by Beiing writers and researchers. This is not medical or clinical review, and no clinician signs off on our content.
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