Trauma & PTSD

Trauma is the lasting emotional and physiological response to an event or series of events that overwhelmed your ability to cope. SAMHSA's widely used definition captures it as the "three E's": an event (or circumstances), experienced as physically or emotionally harmful or life-threatening, with lasting adverse effects on functioning and well-being.

Crucially, trauma is about impact, not the event itself. Two people can go through the same event and be affected very differently. What overwhelms one nervous system may not overwhelm another — and neither response is wrong. This is why the question in trauma-informed care shifts from "What's wrong with you?" to "What happened to you?"

A broadened understanding

Trauma isn't limited to combat or disasters. It includes abuse and neglect, accidents and medical events, violence, the sudden loss of a loved one, and chronic experiences like discrimination or living in an unsafe environment. It can be a single event (acute), repeated, or complex — ongoing and interpersonal, often in childhood.

Adverse Childhood Experiences (ACEs)

The landmark ACE Studyshowed that adversity in childhood — abuse, neglect, and household dysfunction — is common and has a powerful, dose-dependent relationship with adult mental and physical health. The more ACEs a person has, the higher their risk for depression, substance use, and even chronic medical illness later in life. ACEs aren't destiny — but they help explain how early experience can echo for decades, and they underscore why prevention and early support matter.

Most people who experience a trauma do not develop a lasting disorder; the nervous system settles over time. But for some, the response persists and organizes into post-traumatic stress.

Post-traumatic stress disorder (PTSD)

Diagnosed (per the DSM-5-TR) after exposure to actual or threatened death, serious injury, or sexual violence, when symptoms persist for more than a month across four clusters:

• Intrusion — unwanted memories, nightmares, or flashbacks that make the past feel present.
• Avoidance — steering clear of reminders, thoughts, or feelings connected to the trauma.
• Negative changes in thinking and mood — persistent fear, shame, guilt, numbness, or a bleak view of oneself and the world.
• Changes in arousal and reactivity — hypervigilance, startling easily, irritability, trouble sleeping or concentrating.

Complex PTSD (C-PTSD)

Recognized in the ICD-11, complex PTSD develops from prolonged or repeated trauma, often interpersonal and often beginning in childhood (chronic abuse, captivity, ongoing neglect). It includes the core features of PTSD plusthree additional "disturbances in self-organization":

• Emotional dysregulation — difficulty managing intense feelings.
• Negative self-concept — deep, persistent shame, worthlessness, or guilt.
• Relationship difficulties — trouble feeling close to or safe with others.

Trauma symptoms aren't a matter of willpower because trauma lives in the body's survival circuitry — systems that operate faster than conscious thought. Three regions tell most of the story:

• The amygdala (the alarm) becomes overactive and quick to fire, scanning for threat and treating reminders as danger.
• The hippocampus(the memory librarian) can be disrupted, so traumatic memories get stored as fragmented sensations and emotions rather than a coherent, time-stamped story. That's why a flashback feels like now, not then.
• The prefrontal cortex(the brakes) — responsible for reasoning and calming the alarm — can go "offline" under threat, making it hard to think your way out in the moment.

In the body, the autonomic nervous system can get stuck in survival mode — chronically activated (anxious, on guard, easily startled) or shut down (numb, foggy, disconnected). Understanding this reframes symptoms as a nervous system doing its job too well, not a personal failing — and points toward treatments that work with the body, not just the thinking mind.

Coined by Dr. Dan Siegel, the window of tolerance is one of the most useful ideas in trauma recovery. It describes the zone of arousal in which you can think, feel, and engage with life effectively — present and grounded, able to handle stress without being overwhelmed.

Trauma tends to narrowthe window: smaller triggers push you into hyperarousal or hypoarousal, and it's harder to come back. Much of trauma therapy is about widening the window — learning to notice where you are, and using grounding, breathing, and co-regulation to return to the middle zone where healing can happen.

Trauma is treatable, and recovery is common. The therapies with the strongest evidence are trauma-focused — they help you process the experience rather than only manage symptoms. Effective care usually moves in phases: first safety and stabilization, then processing the trauma, then reconnection with life and relationships.

EMDR (Eye Movement Desensitization and Reprocessing)

A structured therapy in which you briefly focus on a traumatic memory while engaging in bilateral stimulation (such as guided eye movements). This appears to help the brain reprocess and "file" the memory so it loses its charge. EMDR is strongly recommended by major guidelines.

Cognitive Processing Therapy (CPT)

A specialized form of CBT that targets the "stuck points" — the distorted beliefs trauma can install about safety, trust, power, esteem, and intimacy (for example, "it was my fault"). CPT helps you examine and shift those beliefs.

Prolonged Exposure (PE)

Helps you gradually and safely approach trauma memories and avoided situations, so they lose their power and the nervous system learns they are no longer dangerous.

Other supports

Medications (often SSRIs) can help manage symptoms alongside therapy. Body-based and skills-based approaches — somatic therapies, and skills training like STAIR for emotion regulation — are especially relevant for complex trauma, where building stability comes first.

Meridian's verified directory includes New Hampshire providers and community mental health centers, many of whom offer trauma-specialized treatment.