Have you ever snapped at someone you love and wondered where that came from? Or sat through a hard conversation and felt yourself go blank, like someone flipped a switch? Most of us have. And most of us blame ourselves for it.
Polyvagal theory offers a kinder explanation. It suggests these reactions aren't character flaws. They're your nervous system doing its job, trying to keep you safe. In this post I want to walk through the basics in plain language, so you can start to recognize your own states.
Where the idea comes from
Polyvagal theory was introduced in 1994 by Dr. Stephen Porges, the researcher who also developed the Safe and Sound Protocol. "Vagal" refers to the vagus nerve, our longest cranial nerve that connects the brain with the heart, lungs and gut. It plays a big part in how your body shifts between feeling calm and feeling under threat.
A core idea is that your nervous system is always scanning for signs of safety or danger, mostly below your awareness. Porges calls this neuroception. Your body often decides how to react before your thinking mind has caught up.
The three states
Polyvagal theory describes three broad states. It can help to picture them as a ladder.
Safe and connected. At the top of the ladder, you feel settled and present. Your breathing is easy and your face is relaxed. You can listen, think clearly, laugh and rest. You can disagree with someone without it feeling like a war. This is where connection with others and healing happen most easily.
Fight or flight. When your nervous system senses danger, it mobilizes. Your heart speeds up, your muscles tense and your focus narrows. You might feel anxious, irritable, restless or angry, or have an urge to get out of the room. This state is built for action, and it's useful when the threat is real.
Shutdown. When a threat feels too big to fight or escape, the body can drop to the bottom of the ladder. Things go flat. You might feel numb, foggy, exhausted or far away. You might scroll your phone for hours or feel like nothing matters. This is a protective state too, a way of conserving energy and getting through something that feels like too much.
We all move up and down this ladder many times a day. That's normal. The trouble comes when we get stuck, or when the body keeps reacting as if danger is present long after it has passed.
Why this matters for trauma
For people who've lived through trauma, especially complex trauma that builds up over years, the nervous system often learns that staying on guard is the safest way to live. It may jump into fight or flight at small cues, like a raised voice or a certain look. Or it may drop into shutdown whenever stress rises.
These reactions made sense at one time. They were the body's best attempt to survive. But they can stay switched on long after the danger is gone, and they can take a toll on relationships, work and sleep.
For many men, for example, fight or flight shows up as anger or a short fuse, and shutdown shows up as "checking out" or feeling worn down. Even drinking, using drugs to numb out or playing endless video games are indicators of this checked out state. Often no one ever gave them words for what was happening inside. Having a name for it can be a relief.
Recognizing your own states
You don't need to understand the biology to use this. A simple start is to pause a few times a day and ask: Where am I on the ladder right now?
Some signs that can help:
Safe and connected: steady breathing, warmth or curiosity, feeling present with people.
Fight or flight: a pounding heart, a tight jaw or shoulders, racing thoughts, irritability.
Shutdown: heaviness, numbness, low energy, wanting to disappear or be left alone.
The goal isn't to stay at the top all the time. No one can. The goal is to notice where you are without judging yourself, and to slowly build more ways back to feeling safe.
How polyvagal-informed therapy helps
In polyvagal-informed therapy, we pay attention to the body as well as the story. Sessions often include noticing your states as they shift, practicing ways to settle, and building a stronger sense of safety over time. Safety comes partly through connection. A calm voice and a steady relationship can help another person's nervous system settle, and that works over video too.
Depending on what fits, this work can be paired with the Safe and Sound Protocol or EMDR therapy. When your nervous system has more room to feel safe, the deeper work tends to go more smoothly.
Like any model, polyvagal theory continues to be studied and refined. I've found it a helpful map for understanding your reactions with less shame.
Taking the first step
If any of this sounds familiar, you're not broken. Your body has been working hard to protect you. I offer a free phone consultation where you can ask questions and get a sense of whether polyvagal-informed interventions fit what you need. I see clients by telehealth throughout California, including Los Gatos, San Jose and Campbell.
This article is for general information and isn't a substitute for professional care. If you're in crisis, call or text 988 to reach the 988 Suicide & Crisis Lifeline, or call 911.