This “Wandering Nerve” Could SHARPEN Your Memory

If you’ve ever wandered into a room and forgotten why… lost your train of thought mid-sentence… or felt like you’re watching life through a haze of mental static—you’re not alone.

And you’re not losing your mind.

Brain fog, memory slips, and lingering headaches have become part of daily life for millions of older adults. And most are told it’s just “normal aging.”

But what if that fog has nothing to do with age at all?

What if the real cause was hiding inside your body all along—quiet, overlooked… and surprisingly fixable?

Nearly 2,000 years ago, Roman physician Galen described a mysterious “wandering nerve” that snaked from the brain through the heart, lungs, and gut.

Today, we know it as the vagus nerve—a central highway in your nervous system that controls everything from your heartbeat to digestion.

In fact, in 1936, a scientist named Otto Loewi won the Nobel Prize for discovering how stimulating the vagus nerve could literally slow down the heart.

Now, nearly a century later, researchers think it could do something even more surprising…

A 2025 clinical trial published in Frontiers in Neurology studied 102 adults with lingering symptoms after mild traumatic brain injury (TBI)—think whiplash, falls, or past head trauma.

Over three months, patients received noninvasive vagus nerve stimulation (nVNS)—gentle, external pulses that activate the vagus nerve.

The results?

• Symptom scores dropped nearly 20%.
• One in three patients reported at least 30% relief in brain fog, headaches, memory slips, and dizziness.
• No serious side effects were reported.

Here’s the kicker: many of these patients had been living with symptoms for months—or even years.

Doctors have long known that the vagus nerve helps regulate inflammation, heart rate, and even mood. But this trial suggests it may also play a role in “neuro-resetting” after brain injuries.

And it doesn’t stop with trauma.

Research shows that vagus nerve dysfunction may also contribute to “inflammaging”—a chronic, low-grade inflammation linked to age-related cognitive decline. In mouse models, vagus nerve stimulation has been shown to reduce brain inflammation and improve memory—suggesting it could help clear the mental fog that comes with age or chronic stress.

So even if you’ve never had a diagnosed concussion or head trauma, the same nerve misfires could still be affecting you. Many seniors experience chronic stress, silent falls, or low-level inflammation that can dysregulate the vagus nerve in similar ways.

That means brain fog, dizziness, or memory blips may not be signs of aging—but of a nervous system stuck in survival mode.

Because when the vagus nerve is underactive—due to injury, stress, or aging—your body can get stuck in a low-grade fight-or-flight mode. That chronic stress state has been linked to:

• Poor memory and mental fatigue
• Anxiety and low mood
• Disrupted sleep
• Heart rhythm issues

Vagus nerve stimulation is already FDA-approved for migraine and epilepsy—and it’s being studied for Alzheimer’s, depression, and even long COVID.

But most doctors still don’t connect this powerful nerve to the “everyday” fog that plagues so many older adults.

We even covered the importance of the vagus nerve in an issue last year, where it was shown to tame stress and boost resilience—especially during tough times. Now, research suggests it may also play a role in clearing mental fog and restoring calm after head trauma or chronic inflammation.

You don’t need a device to give your vagus nerve a gentle boost. Research shows several natural techniques can help regulate and stimulate it:

• Slow, deep breathing
• Cold exposure (try splashing cold water on your face)
• Singing, humming, or gargling
• Meditation and prayer
• Yoga or tai chi

These activities stimulate vagal tone, which helps shift your body out of stress mode and into healing mode.

And when the fog lifts—even a little—you’ll know your body’s most ancient nerve is back online.

To less fog and more focus,

Rachel Mace
Managing Editorial Director, e-Alert
with contributions from the research team

Sources:

• Gaynor, L. S., Schwarzbold, M. L., Bispo, J. M., Nunes, J. C., Castro, C., Ruedell, M. A., … & Cavalli, V. (2025). Noninvasive vagus nerve stimulation for persistent symptoms after mild traumatic brain injury: A randomized clinical trial. Frontiers in Neurology, 16, 1184039. https://doi.org/10.3389/fneur.2025.1184039
• Tucker, M. E. (2025, July 19). Vagus nerve stimulation may help reduce mild TBI symptoms. Medscape. https://www.medscape.com/viewarticle/vagus-nerve-stimulation-may-help-reduce-mild-tbi-symptoms-2025a1000oe7
• Nobel Prize. (n.d.). Otto Loewi – Nobel Lecture: On the background of the discovery of the chemical transmission of nerve action. NobelPrize.org. https://www.nobelprize.org/prizes/medicine/1936/loewi/lecture/
• Jiang, Y., Lü, L., & Zhao, X. (2018). Vagus nerve stimulation attenuates cognitive impairment and neuroinflammation via the cholinergic anti-inflammatory pathway in a murine model of aging. Aging Clinical and Experimental Research, 30(9), 1077–1086. https://doi.org/10.1007/s40520-018-0910-3
• Bonaz, B., Sinniger, V., & Pellissier, S. (2016). Vagus nerve stimulation: A new promising therapeutic tool in inflammatory bowel disease. Journal of Internal Medicine, 280(1), 34–46. https://doi.org/10.1111/joim.12407
• O’Leary, G. H., Johnson, D. M., & O’Halloran, K. D. (2021). Vagus nerve stimulation modulates inflammation and cognitive decline in aging: A review of mechanisms and future directions. Experimental Gerontology, 149, 111341. https://doi.org/10.1016/j.exger.2021.111341