A Physician's Perspective on Trauma, Trust, and Healing the Nervous System

"In You, I Trust"

By Dr. Robert Setari

Over the years, both as a physician and as someone who has spent a great deal of time listening carefully to patients’ lives, I’ve come to a simple but powerful conclusion about trauma and mental health.

Despite the many theories, diagnoses, and technical explanations we use in medicine and psychology, most psychological trauma can be traced back to one central experience: a break in trust that leaves the nervous system feeling unsafe.

This isn’t an abstract idea. It’s something I see every day in clinical practice.

When patients come to me struggling with anxiety, depression, panic, emotional numbness, or a deep sense that something inside them feels “off,” their stories may look very different on the surface. But underneath, they almost always share a common thread. At some point, something—or someone—they relied on failed them in a meaningful way.

Trust is not just emotional. It is biological.

Your nervous system is constantly assessing whether it is safe to relax, connect, and function normally. From early childhood onward, the brain and body are quietly asking a few fundamental questions: Am I safe? Can I rely on others? Will I be protected when I’m vulnerable?

When those expectations are met consistently, the nervous system stays regulated. When they are violated—through neglect, abandonment, betrayal, loss, illness, or unpredictability—the nervous system adapts. It shifts into protection mode. That shift is what we later call trauma.

In childhood, trust is built through caregivers. Children are biologically dependent on adults not just for emotional comfort, but for nervous-system regulation itself. When caregivers are inconsistent, emotionally unavailable, frightening, or abusive, the child’s nervous system learns early that safety is uncertain. Even without obvious abuse, chronic emotional absence or unpredictability can quietly fracture trust.

Children don’t analyze this intellectually. Their nervous systems adapt automatically. They may become hypervigilant, withdrawn, overly self-reliant, or highly sensitive to rejection. These patterns are not flaws. They are survival strategies that once made sense.

Trauma doesn’t end with childhood. In adulthood, trust can be broken in new and equally profound ways. Relationship betrayal, infidelity, sudden divorce, emotional abandonment, or chronic invalidation can all shatter the assumption that this person is safe. I often see patients surprised by how physically intense these experiences feel. But what they are experiencing is not just emotional pain—it is a nervous system responding to a collapse in safety.

Loss and grief can have a similar effect. When someone close to us dies suddenly, patients often tell me, “The world doesn’t feel safe anymore.” That’s not a metaphor. It’s a precise description of what happens when trust in continuity and predictability is broken.

Medical illness and bodily trauma can also be deeply destabilizing. When the body fails unexpectedly, patients may lose trust in their own physical safety. Anxiety, panic, and hypervigilance often follow—not because the patient is fragile, but because the nervous system learned that even the body cannot always be relied upon.

Even accidents or random events can cause trauma. When something terrible happens without warning, the nervous system may decide that the world itself is unsafe.

Although these experiences differ, they all lead to the same outcome: a nervous system that no longer expects safety.

This is why mental health symptoms look so different from person to person. Some people become anxious and constantly alert. Others become depressed and withdraw, because engagement feels dangerous. Some experience panic, dissociation, or emotional numbness. Others struggle with closeness and trust in relationships. These are not random problems. They are predictable responses to lost trust.

Modern neuroscience supports this understanding. The brain is designed to prioritize safety above all else. When safety and trust are present, the system relaxes. When they are lost, the system stays in survival mode. Over time, living this way becomes exhausting and painful—but it is still a form of protection.

This perspective also helps explain why newer treatments such as psychedelic-assisted therapy and transcranial magnetic stimulation (TMS) can be so powerful when used appropriately and responsibly.

Psychedelic-assisted treatments appear to work, in part, by temporarily loosening rigid patterns of thought and identity that were formed around trauma. Trauma often locks the mind into a fixed narrative: I am not safe. I cannot trust. I must stay guarded. Psychedelic experiences can gently disrupt that rigidity, allowing patients to step outside their habitual fear-based identity and experience themselves—and the world—without the same defensive filters.

Many patients describe this as a “reset” of the ego. From a medical standpoint, what’s happening is that deeply entrenched neural pathways are momentarily softened, making room for new perspectives, emotional openness, and a felt sense of connection or safety that may have been absent for years. In that state, trust can be experienced again—not as an idea, but as a lived sensation.

TMS works through a different but complementary mechanism. Transcranial magnetic stimulation uses targeted magnetic pulses to activate specific regions of the brain that are underactive in depression, anxiety, and trauma-related conditions. By repeatedly stimulating these circuits, TMS leverages the brain’s natural ability to change—what we call neuroplasticity.

Trauma can lock the brain into maladaptive patterns, reinforcing fear, hopelessness, or emotional shutdown. TMS helps the brain form new, healthier pathways. Over time, patients often find that their emotional responses feel less rigid, less reactive, and more flexible. This increased flexibility allows the nervous system to move out of survival mode and gradually relearn safety.

In both cases, these treatments do not erase the past. They do not force trust. Instead, they create the biological conditions necessary for healing. They give the nervous system an opportunity to experience regulation again, often for the first time in years.

From a physician’s perspective, this is critical. Healing trauma is not about convincing someone that they are safe. It is about helping the nervous system feel safe again. That is why consistency, careful guidance, and integration with psychotherapy are so important.

Mental health conditions are not personal failures. They are not signs that something is fundamentally wrong with you. They are signals from a nervous system that adapted to broken trust.

When patients understand this, something important shifts. Self-blame softens. Shame begins to loosen. Symptoms start to make sense. Treatment becomes less about fixing what’s broken and more about rebuilding what was lost.

At its core, healing is about restoring safety—within the body, within relationships, and within one’s sense of self. Tools like psychotherapy, TMS, and psychedelic-assisted treatments are not shortcuts. They are ways of helping the brain and nervous system remember what trust feels like again.

That restoration of trust—slow, embodied, and real—is where lasting healing begins.