“The body keeps the score” means that traumatic experiences leave lasting imprints not just in your thoughts and emotions, but in your physical body. The phrase comes from psychiatrist Bessel van der Kolk’s landmark book of the same name, and it captures a central idea in trauma science: when something overwhelming happens to you, your nervous system records it and can stay stuck in a state of alarm long after the danger has passed. Your muscles, your gut, your heart rate, your immune system all carry the residue of what happened, even when your conscious mind has moved on or pushed the memory away.
How Trauma Reshapes the Brain
To understand why the body “keeps score,” it helps to know what trauma does to brain architecture. Your brain has a built-in smoke detector, a region that scans for threats and triggers your survival instincts. It also has a kind of watchtower, the upper brain area responsible for pausing, reflecting, and making rational decisions. In a healthy stress response, the watchtower helps calm the smoke detector once a threat has passed.
In people with PTSD, this system breaks down. Brain imaging research shows that adults with PTSD have increased activity in the smoke detector region, producing a heightened startle response and flooding the body with stress chemicals. At the same time, the watchtower area actually shrinks in volume, along with the part of the brain responsible for organizing memories. The result is a brain that fires alarm signals too easily and struggles to turn them off. As van der Kolk puts it, the survival part of the brain “does not return to baseline after the threat is over.”
A Biology Rewired for Threat
One of van der Kolk’s most striking claims is that trauma changes a person’s biology into “a biology of threat.” This plays out across multiple systems. Stress hormones, immune function, and even what the brain selects to pay attention to all shift in measurable ways.
The body’s central stress system, which controls the release of the hormone cortisol, behaves differently in trauma survivors than in people under ordinary chronic stress. You might expect trauma survivors to have elevated cortisol from being constantly on edge. In reality, research published in The Journal of Clinical Psychiatry found the opposite: people with PTSD often have lower baseline cortisol levels than both non-traumatized people and trauma survivors without PTSD. Their stress system has become so sensitized that it over-corrects, dialing cortisol down while remaining hyperreactive to new triggers. This explains why someone can seem calm on the surface yet have an explosive physical reaction to a loud noise, a certain smell, or an unexpected touch.
The autonomic nervous system also gets recalibrated. Polyvagal theory describes three distinct states your nervous system can enter: a calm social mode, a mobilized fight-or-flight mode, and a shutdown or freeze mode used as a last resort during life-threatening danger. Trauma can leave people cycling between fight-or-flight and shutdown without easy access to that calm, connected state. The body gets stuck, toggling between panic and collapse.
Where Trauma Shows Up Physically
Because the nervous system and stress hormones affect virtually every organ, unresolved trauma can surface as chronic physical symptoms that seem unrelated to any psychological event. Pain is the most common. But gastrointestinal problems like nausea and abdominal pain, fatigue, numbness, and muscle weakness are also frequently reported. Conditions like fibromyalgia, irritable bowel syndrome, and chronic fatigue syndrome overlap significantly with trauma histories.
The long-term health consequences are dramatic. The CDC’s research on Adverse Childhood Experiences (ACEs) found that preventing childhood trauma could reduce cases of heart disease by 22% and depression by 78% in adults. ACEs are also linked to higher rates of cancer, diabetes, and suicide. The economic toll in the United States alone is estimated at $14.1 trillion annually in medical spending and lost healthy years. These numbers make a concrete case for what “the body keeps the score” looks like at a population level: childhood adversity doesn’t just cause psychological suffering, it shortens lives.
Why Talk Therapy Alone Isn’t Always Enough
A key implication of the concept is that trauma stored in the body can’t always be resolved by talking about it. Traditional talk therapy works “top down,” engaging the reasoning and planning centers of the upper brain to reframe thoughts and beliefs. This can be effective, but it primarily targets the watchtower, not the smoke detector. Van der Kolk argues that because the survival brain operates below conscious awareness, accessing it requires working through what you physically feel inside your body, not just what you think about what happened.
This is the logic behind “bottom-up” therapies that start with the body’s responses rather than conscious thought. These approaches engage the lower brain centers responsible for automatic reactions like fear, fight-or-flight, and emotional regulation. The idea is to help the nervous system complete the defensive responses it got stuck in, gradually teaching it that the threat is over.
Body-Based Approaches to Healing
Several therapies have emerged from this understanding. EMDR (Eye Movement Desensitization and Reprocessing) is one of the most studied. During an EMDR session, you recall a traumatic memory while following a therapist’s finger or a light bar with your eyes. The leading explanation for why this works involves working memory: holding a disturbing memory in mind while simultaneously performing eye movements overloads the brain’s processing capacity, causing the memory to lose some of its vividness and emotional charge. Over time, the memory remains but no longer triggers the same alarm response. Meta-analyses have found EMDR outperforms both no treatment and cognitive behavioral therapy for reducing depressive symptoms in trauma survivors.
Trauma-sensitive yoga takes a different route. A five-year randomized controlled trial with women veterans found that yoga produced large reductions in PTSD symptom severity, comparable to a standard talk-based trauma therapy. Notably, 60% of participants completed the yoga program compared to only 38% who completed the talk therapy, suggesting the body-based approach was more tolerable for people who found it difficult to sit with verbal processing of their trauma.
Van der Kolk points to a unifying principle behind these methods: “the only way we can consciously access that disturbed survival brain is through our interoceptive pathways,” meaning the internal sensing system that tells you what’s happening deep inside your body. Practices that help you notice and tolerate physical sensations, whether through guided movement, breathwork, or focused attention, give the nervous system a way to gradually release what it’s been holding. The body kept the score, and the body is also part of how you settle it.