What is Polyvagal Theory and How Does It Help Us to Understand Trauma?
Have you ever wondered why your body reacts so strongly after a stressful or traumatic experience, even when your mind knows you’re safe now? Maybe your heart races when someone raises their voice. Maybe you suddenly “shut down” during conflict. Or perhaps you constantly feel on edge, exhausted, disconnected, or unable to relax.
These reactions can feel confusing, especially when we try to “think logically” about them. But according to Stephen Porges, who developed Polyvagal Theory, the body has its own built-in survival system that works automatically, often before we are even aware of it.
Polyvagal Theory gives us a way to understand how our nervous system responds to safety, danger, and trauma. It explains why trauma is not just something we remember in our minds, it is something our bodies experience and carry too.
Polyvagal Theory is a theory about the autonomic nervous system, the part of the nervous system that controls automatic functions like breathing, heart rate, digestion, and survival responses.
The theory was developed by neuroscientist Stephen Porges in the 1990’s. In simple terms, Polyvagal theory suggests that our nervous system is always asking one important question: “Am I safe?”
Depending on the answer, our body moves into different states designed to help us survive. These states are not choices. They happen automatically.
Polyvagal Theory describes 3 main nervous system states:
The Safe and Connected State (Ventral Vagal)
This is the state where you feel calm, grounded, connected, and emotionally present. When we are in this state, we can think clearly, connect with other people, feel curious and creative, regulate emotions more easily, rest and recover. Our body feels relatively safe here. You might notice steady breathing, relaxed muscles, ability to make eye contact, feeling emotionally open. This is sometimes called the “social engagement system” because connection with others feels possible and safe.
The Fight-or-Flight State (Sympathetic Activation)
When the nervous system senses danger, it shifts into survival mode. This is the classic fight-or-flight response. The body prepares to protect itself by increasing heart rate, releasing stress hormones, tightening muscles, becoming hyper-alert. Emotionally, this can look like anxiety, panic, anger, irritability, restlessness, overthinking. People who have experienced trauma may spend a lot of time in this state because their nervous system has learned that the world is unsafe. Even small triggers can activate survival responses.
The Shutdown (Dorsal Vagal)
If the nervous system believes fighting or escaping will not work, it may move into a shutdown or freeze response. This is not laziness or weakness. It is a deeply protective survival response. People in this state may feel numb, disconnected, exhausted, emotionally flat, hopeless, dissociated. They may struggle to get out of bed, feel motivated, connect with others, and feel fully present. This state often develops when someone experiences overwhelming stress, chronic trauma, neglect, or situations where they felt trapped or powerless.
Trauma is not only about what happened to someone. It is also about what happened inside the nervous system as a result of those experiences. Polyvagal Theory helps explain why trauma responses continue long after the danger is over. For example, a person who experienced childhood criticism may become anxious during minor disagreements, or someone who experienced abuse may shut down emotionally during conflict, or a person who lived in unpredictable environments may constantly scan for danger.
Their nervous system learned survival patterns that once helped protect them. The body remembers. This understanding can be incredibly compassionate because it shifts the question from “Whats wrong with me?” to “What happened to me, and how did my nervous system adapt to survive?”
One reason Polyvagal Theory has become so influential in trauma work is because it helps people understand that trauma reactions are biological, not personal failures. It also highlights the importance of safety and connection in healing. Many trauma therapies now focus not only on thoughts and memories, but also on helping the nervous system feel regulated again.
This may include breathwork, grounding exercises, safe relationships, therapy, gentle movement, mindfulness, body-based therapies, rest and co-regulation with supportive people. Healing often begins when the nervous system experiences enough safety to stop living in constant survival mode.
A trigger is not simply an overreaction. From a Polyvagal perspective, a trigger is the nervous system detecting possible danger based on past experiences. The body reacts first, often before the thinking brain catches up. This is why trauma responses can feel automatic. Someone may logically know they are safe, while their body still reacts as if danger is present. Understanding this can reduce shame and create more self-compassion.
Polyvagal Theory also emphasizes something many people overlook: Humans regulate each other. Safe relationships help calm the nervous system. A gentle voice, kind eye contact, emotional safety, and supportive connection can all help the body move out of survival states. This is called co-regulation. For people with trauma histories, healing often happens in relationships where they finally feel seen, safe, respected, and emotionally supported.
Polyvagal Theory gives us a powerful framework for understanding trauma in a more compassionate and human way. It reminds us that many trauma responses are not signs of weakness or dysfunction, they are intelligent survival responses created by the nervous system. When we understand how the body responds to safety and danger, we can begin to approach healing with more patience, self-awareness, and compassion. Healing is not about forcing ourselves to “just get over it.” Often, it is about helping the nervous system slowly learn that safety is possible again.
References
Stephen Porges (2011). The Polyvagal Theory: Neurophysiological Foundations of Emotions, Attachment, Communication, and Self-Regulation.
Deb Dana (2018). The Polyvagal Theory in Therapy: Engaging the Rhythm of Regulation.
Bessel van der Kolk (2014). The Body Keeps the Score: Brain, Mind, and Body in the Healing of Trauma.
