What is Trauma?
Trauma occurs when an individual experiences overwhelming or distressing events that exceed the body’s and mind’s ability to process and cope. Trauma can be caused by a single event or ongoing stressors, and it significantly impacts both psychological and physiological functioning.
Our brains are wired for survival. When a threat is perceived, the Sympathetic Nervous System (SNS) activates, preparing the body for action—either by fighting, fleeing, or freezing. The Autonomic Nervous System (ANS) regulates these survival responses, working to maintain the body’s internal balance, or homeostasis. The Parasympathetic Nervous System (PNS) helps restore calm by counteracting the SNS, bringing the body back to a "rest and digest" state once the danger has passed.

However, prolonged trauma can disrupt this balance, impairing the nervous system’s ability to regulate itself. Chronic activation of the SNS leads to hyperarousal, which is often experienced as persistent anxiety, insomnia, irritability, and a constant sense of being "on edge." Meanwhile, lack of PNS activation due to ongoing stress can result in hypoarousal, which manifests as emotional numbness, dissociation, or feeling "frozen" and detached from reality.
Common Trauma Responses: Fight, Flight, and Freeze
Fight Response:
The fight response is triggered by the SNS in response to perceived danger, preparing the body to confront or defend against a threat. Emotionally, this response manifests as anger, frustration, or defensiveness. Physically, it may cause muscle tension, increased heart rate and blood pressure, rapid breathing, and restlessness. Behavioral manifestations of this response include aggression, over-control, and avoidance of vulnerability.
Flight Response:
The flight response, also triggered by the SNS, prepares the body to escape a threat. Emotionally, it can lead to anxiety, panic, avoidance of negative emotions, or a feeling of being overwhelmed. Physically, the flight response often results in shallow breathing, hyperventilation, chest tightness, and fatigue. Behaviors linked to this response include withdrawal, avoidance, overworking, distraction, and denial.
Freeze Response:
The freeze response, activated by the dorsal vagal branch of the PNS, occurs when a threat feels insurmountable or unavoidable. This survival mechanism leads to emotional numbness, helplessness, and dissociation. Physically, it manifests as immobilization, muscle tension, and fatigue. Behaviors related to this response include inertia, social withdrawal, disconnection from reality, and shutdown.
Trauma and Memory
Trauma impacts critical brain areas like the hippocampus, which is responsible for memory formation and distinguishing between past and present experiences. When the hippocampus is dysregulated by trauma, memories may not be properly stored or contextualized, resulting in fragmented, vivid, and intrusive recollections. Traumatic memories can resurface in the present moment without the proper context of time, leading to flashbacks and emotional overwhelm.
Trauma and Hormones
Trauma can have a profound effect on the body’s regulation of stress hormones, particularly cortisol and adrenaline. Adrenaline, or epinephrine, is the body’s primary "fight-or-flight" hormone, preparing it for immediate action. Chronic trauma can lead to persistently elevated adrenaline levels, keeping the body in a state of hypervigilance, which contributes to anxiety and heightened stress.
Cortisol, known as the "stress hormone," plays a key role in the body's stress response by suppressing non-essential functions. Prolonged trauma can cause elevated cortisol levels, which can impair immune function, increase inflammation, and lead to chronic fatigue, anxiety, and mood disturbances. Proper management of cortisol through trauma therapy and lifestyle changes can help restore balance in the body’s stress response system.
Healing Trauma: Targeting the Brain and Body
The good news is that trauma is not permanent. Neuroplasticity—the brain’s ability to reorganize and adapt—offers a path to healing. Trauma-focused therapies such as EMDR, Cognitive Behavioral Therapy (CBT), somatic experiencing, and mindfulness techniques work to rewire the brain and restore balance to the nervous system. These approaches promote emotional regulation and help integrate traumatic memories in a way that minimizes their disruptive impact on daily life. If you’re struggling with the effects of trauma, healing trauma through therapy can be transformative. Not only does trauma therapy help manage symptoms like anxiety, insomnia, and dissociation, but it also targets the root causes of trauma and the dysregulation of the nervous system, allowing for deeper healing.
Wishing you all the best on your healing journey,
