4 min read
The vagus nerve
The main highway between body and brain.
The vagus nerve is the longest cranial nerve. It runs from the brainstem through the face, throat, heart, lungs, and gut, branching widely as it goes.
It carries signals both ways. About 80% of those signals travel from the body up to the brain - meaning the state of your body strongly shapes how you feel, more than the other way around.
Higher 'vagal tone' is associated with better stress recovery, smoother digestion, steadier mood, and easier social connection. It's something you can gently train.
Practices that engage the throat and face - humming, gentle gargling, soft singing, slow nasal breathing - stimulate the vagus directly. Long exhales, warmth, and safe social contact also support it.
You don't need to do any of these intensely. A minute of soft humming, done most days, is more useful than an occasional long session.
Key points
- Most vagal signaling goes from body to brain.
- Vagal tone can be gently trained.
- Humming, slow exhale, and warmth are reliable supports.