Most of the women I work with aren’t living through a single dramatic crisis. They’re living with a low, constant hum of stress — the kind that never fully switches off. And over time, that hum changes the body. One of the first places it shows up is the vagus nerve.
The vagus nerve is the tenth and longest of your cranial nerves. It begins in the brainstem and wanders down through the neck, the chest, and into the abdomen, touching the heart, the lungs, and nearly the entire digestive tract along the way. Its name comes from the Latin word for “wandering,” which tells you everything about its reach. It is the main highway of your parasympathetic nervous system — the branch responsible for rest, digestion, repair, and calm. And it carries information in both directions: from the brain down to the organs, and from the body back up to the brain. It is, in a very real sense, the line your body uses to tell itself it is safe.
“Vagal tone” describes how strong and responsive that signal is. You can think of it like the strength of a muscle, or the responsiveness of a brake. When your vagal tone is strong, your body drops into a calm state easily and recovers quickly after something stressful — your heart rate settles, your breath deepens, your whole system resets. (This is often measured through heart rate variability, the subtle beat-to-beat changes in your heart rhythm that reflect how flexibly your nervous system is responding.) When your vagal tone is poor, that brake is weak. The calming signal is faint, slow, and easily overridden.
This is exactly what chronic stress does. When the body spends months or years in a state of low-grade sympathetic activation — the “fight or flight” side of the nervous system — the vagus nerve grows underused and underpowered, the way a muscle weakens when it is never asked to work. The gas pedal is pressed constantly, and the brake quietly loses its strength.
The result is a body that struggles to get into a parasympathetic state at all. Even when the stressful moment has passed, the system doesn’t fully stand down. You might notice it as a racing or pounding heart, breath that stays shallow and high in the chest, digestion that feels sluggish or unpredictable, sleep that won’t deepen, and that unmistakable “wired but tired” feeling — exhausted and on edge at the same time. For women, this ripples directly into hormonal health, because a nervous system that can’t reach calm keeps the body in a stress-dominant state that shapes everything downstream. The body isn’t broken. It simply hasn’t been given the signal — or the practice — it needs to come down.
The good news is that vagal tone is trainable. Like any muscle, the vagus nerve responds to consistent, gentle use. These are five of my favorite ways to strengthen it.
- The first is pulling gently on your ears. A branch of the vagus nerve actually reaches the outer ear, which is why slow, gentle tugging — downward, outward, in soft circles — can send a calming signal straight to the nervous system.
- The second is humming. The vagus passes through the throat and voice box, so the vibration of a long, low hum stimulates it directly, while the slow exhale that humming requires deepens the effect.
- The third is extended-exhale breathing. Your vagus nerve is most active on the out-breath, so simply making your exhale longer than your inhale — breathing in for four, out for six or eight — gently strengthens its signal.
- The fourth is cold exposure. A splash of cold water on the face, or the end of a shower turned cool, triggers a reflex that slows the heart and activates the vagus almost instantly.
- And the fifth is gargling. The muscles at the back of your throat are vagus territory, so a vigorous gargle with a glass of water becomes a surprisingly effective little workout for the nerve.
None of these require much time. What they require is repetition. Tone is built in small, ordinary moments — and the more often you send your body the signal that it is safe, the more easily it learns to find calm on its own.
