The Wandering Nerve: What the Vagus Nerve Is Actually Doing Inside Your Body

In the last several years, the vagus nerve has moved from medical textbooks into wellness conversations, supplement labels, and lifestyle apps. Cold plunges, humming, slow breathing, and ear massages are all being marketed, with varying degrees of scientific rigor, as ways to stimulate it. But most people searching for ways to activate their vagus nerve have only a vague sense of what it actually is, what it does, and why supporting it might matter to their health.