Meet Your “TEAM Autonomic Nervous System” — An Introduction to Polyvagal Theory

“Autonomic Imbalance” — What Does That Actually Mean?

You’ve probably heard the phrase “autonomic nervous system imbalance” as a cause of various health issues. It sounds familiar, but do you actually understand what it means? Let’s take a closer look!

Wait — There’s a THIRD Autonomic Nerve?

Most people know the autonomic nervous system as two parts:
– Sympathetic nervous system = the gas pedal (activity, fight-or-flight)
– Parasympathetic nervous system = the brake (rest, relaxation)

But in 1994, an American researcher in psychophysiology proposed that the autonomic nervous system actually has three components. This is called Polyvagal Theory.

Your Body Reveals Your Mind

You might be thinking, “Okay, so three instead of two — so what?” (Ha!)

Here’s why it matters: this theory helps explain why you react the way you do in stressful situations and relationships. Polyvagal Theory describes the state of your mind through the lens of nervous system physiology.

States like “I can’t feel safe,” “I can’t move,” or “I’m constantly irritated” aren’t just mental attitudes — they’re neurological defense responses. This insight has been transformative in the field of trauma treatment.

The Three Members of Your Team

1. The Action Nerve — Sympathetic Nervous System
Fight, flee, push through. This is your “go mode” for work, sports, and survival. When you feel tense or anxious, this nerve is working hard. In our overstimulating modern world, many people are stuck in sympathetic overdrive and can’t rest.

2. The Safety Nerve — Ventral Vagus Nerve
This nerve is sometimes called the “social connection” nerve. It reads safety through tone of voice, eye contact, breathing, and posture. When it’s active, your breathing deepens, conversations feel easy, and your body relaxes.

3. The Shutdown Nerve — Dorsal Vagus Nerve
When stress or fear becomes overwhelming, the body says: “I need to stop feeling this.” That’s the dorsal vagus response. Lethargy, brain fog, inability to move — these aren’t signs of laziness or weakness. They’re your body hitting the emergency brake to protect itself. When this nerve stays dominant too long, energy drops and both mind and body enter a state of shutdown.

How Acupuncture Can Help

All three of these nerves exist to protect you. But when one becomes too dominant or too weak, your mind-body balance suffers.

This is where acupuncture comes in. Acupuncture stimulation has a remarkable property: it calms what’s overactive and supports what’s underactive.

When patients say during treatment, “My breathing got deeper” or “Everything looks brighter” — that’s the nervous system switching into safety mode.

Mind and Body Are One

In Eastern medicine, there’s an ancient concept called “shinshin ichinyo” (心身一如) — the idea that mind and body cannot be separated.

Polyvagal Theory essentially explains this same idea through modern science. And acupuncture? It’s one gentle way to reach that switch.

There’s more fascinating material about the mind-body connection to share — stay tuned for the next installment!