Some say a cure for ailments like anxiety is flowing from the brain. But much is unknown.

By Christina Caron

In recent years, the vagus nerve has become an object of fascination, especially on social media. The vagal nerve fibers, which run from the brain to the abdomen, have been anointed by some influencers as the key to reducing anxiety, regulating the nervous system, and helping the body to relax.

TikTok videos with the hashtag “#vagusnerve” have been viewed more than 64 million times, and there are nearly 70,000 posts with the hashtag on Instagram. Some of the most popular ones feature simple hacks to “tone” or “reset” the vagus nerve, in which people plunge their faces into ice water or lie on their backs with ice packs on their chests.

Now, wellness companies have capitalized on the trend, offering products like vagus massage oil, pillow mists, and vibrating bracelets. These products claim to stimulate the nerve, but they have not been endorsed by the scientific community.

Researchers who study the vagus nerve say that stimulating it with electrodes can potentially help improve mood and alleviate symptoms in those who suffer from treatment-resistant depression, among other ailments. But are there other ways to activate the vagus nerve? Who would benefit most from doing so? And what exactly is the vagus nerve, anyway? Here’s a look at what we know so far.

What is the vagus nerve?

The term “vagus nerve” is actually shorthand for thousands of fibers. They are organized into two bundles that run from the brain stem down through each side of the next and into the torso, branching outward to touch our internal organs, said Dr. Kevin J. Tracey, a neurosurgeon and president of the Feinstein Institutes for Medical Research, Northwell Health’s research center in New York.

Imagine something akin to a tree, whose limbs interact with nearly every organ system in the body. (The word “vagus” means “wandering” in Latin.)

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