Free eBook · Revised 2026 edition

A plain-English guide to the nerve that links your brain with your heart, lungs and gut, and to the everyday habits linked with healthier vagal function.

What’s inside

• How the vagus nerve works, from the brainstem to the gut
• What can go wrong, and which symptoms need a doctor rather than a home remedy
• Simple at-home checks: heart rate variability, resting heart rate and a breathing check
• Everyday practices: slow breathing, humming, gentle cold, sleep and exercise
• What the evidence says about acupuncture, massage and vagus nerve stimulation devices, including what the FDA has approved
• A 7-day quick-start plan, and 59 references you can check for yourself

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81 pages, PDF. Written by Michelle Greene and revised in October 2026. The book is general education, not medical advice.