The Vagus Nerve: Why It Plays a Key Role in Stress and Emotional Balance

Two women in a cold plunge tub

The vagus nerve has become a topic of growing interest in the fields of neuroscience, psychology, and wellness. Despite its relatively small size, it plays a remarkably important role in regulating how the body responds to stress. The vagus nerve runs from the brainstem through the neck and down into the chest and abdomen, connecting the brain with several major organs including the heart, lungs, and digestive system. It forms a central part of the parasympathetic nervous system, which is responsible for the body’s rest-and-digest state. When this system is active, the body can relax, repair tissues, digest food effectively, and maintain emotional balance.

In contrast, the sympathetic nervous system activates the well-known fight-or-flight response. This response is helpful when we need to react quickly to danger, but it is not meant to remain active all the time.

The vagus nerve helps guide the body back into calm once a stressful event has passed.

What makes this nerve particularly fascinating is that its activity can be influenced through certain practices. Slow breathing, especially breathing that lengthens the exhale, has been shown to stimulate the vagal response and encourage relaxation. Other practices such as humming, singing, gentle yoga, meditation, and cold exposure, like splashing cool water on the face, can also activate the vagus nerve.

Many of these techniques are incorporated into wellness practices designed to regulate the nervous system. At retreats, guests often experience noticeable changes after several days of these practices. Breathing becomes deeper, sleep improves, and the body begins to settle into a calmer rhythm.

While the vagus nerve itself may be small, its role in helping the body recover from stress is profound.