"Trauma-informed" is a term used to describe a program, organization, or system that:

• Realizes the widespread impact of trauma and understands potential paths for recovery;
• Recognizes the signs and symptoms of trauma in clients, families, staff, and others involved with the system;
• Responds by fully integrating knowledge about trauma into policies, procedures, and practices; and
• Seeks to actively resist re-traumatization.

This approach is based on the recognition that many people have experienced some form of trauma in their lives, and those experiences can significantly impact their behavior, emotions, relationships, and overall well-being.

In a trauma-informed approach, the focus is not on what's wrong with a person but rather what has happened to a person. This shift in perspective can lead to more empathetic and effective services, whether in healthcare, social work, education, criminal justice, or other sectors.

Implementing a trauma-informed approach involves ongoing education and training for staff, modifying policies and procedures, and creating safe and supportive environments that empower individuals rather than reinforce power differentials. This approach can also involve trauma-specific interventions designed to address the consequences of trauma and facilitate healing and recovery.

Trauma generally refers to severe and distressing experiences or events. Trauma can occur at the physical and/or psychological level:

• Physical Trauma: This is a physical injury. It might be a single event or occur repeatedly, and it can result from various causes, including accidents, falls, hits, weapons, and other external sources of harm. In the medical field, trauma often refers to severe injuries that pose immediate threats to a person's health or life.
• Psychological Trauma: This is a type of damage that occurs to the psyche following a deeply distressing or disturbing event or series of events. This might include abuse, neglect, loss, disaster, war, and other extreme events. These experiences can lead to post-traumatic stress disorder (PTSD), acute stress reaction, and various other mental health conditions.

In both cases, the traumatic event is usually one that is outside the range of normal human experience — something that would be deeply distressing to almost anyone. It's also important to remember that individual responses to traumatic events can vary widely, and what may be traumatic for one person might not be for another.

Complex trauma refers to a type of trauma that occurs repeatedly and cumulatively, usually over a period of time and within specific relationships and contexts. It differs from single-incident traumas (which are referred to as "acute trauma") by the nature of the events. The traumatic events are often invasive and interpersonal, meaning they are premeditated, planned, and caused by other humans, such as experiencing chronic maltreatment, neglect or abuse during childhood.

The effects of complex trauma are often cumulative, as the individual experiences multiple traumatic events, often invasive, interpersonal, and early-life in nature. Those who suffer from complex trauma can exhibit a wide range of symptoms, which may include difficulties with emotional regulation, consciousness and memory, self-perception, relationships with others, distorted perceptions of the perpetrator of the trauma, and difficulties with their system of meanings.

The impact of complex trauma is very profound. A child's exposure to one type of trauma can be predictive of other types of harm and traumas. Such exposure to adversities can lead to a wide range of negative outcomes in mental health, physical health, education, and employment.

Treatment for complex trauma typically requires a multi-modal approach, and may take considerable time, due to the numerous triggers and the ingrained nature of the behaviors, which are often survival strategies that were developed by the individual to cope with the traumatic environment.

Complex Post-Traumatic Stress Disorder (C-PTSD) is a condition that results from repeated, chronic, or prolonged instances of interpersonal trauma and severe neglect or abuse in a context where the individual has little or no chance of escape. C-PTSD is a specific subtype of PTSD, distinguished by additional symptoms reflecting difficulties with emotion regulation, self-perception, relationships with others, and dissociation.

In other words, complex trauma is the experience of traumatic stressors that are interpersonal, prolonged, or repeated experiences, often occurring during critical periods of development during childhood. In contrast, C-PTSD is a diagnosis proposed for the clinical symptoms and difficulties in functioning that can result from experiencing complex trauma.

Here are the key features of C-PTSD, according to the International Classification of Diseases (ICD-11) by the World Health Organization:

• Re-experiencing the trauma in the present in such ways as flashbacks, nightmares, and prolonged distress after reminders of the trauma.
• Avoiding thoughts, feelings, and internal and external reminders of the trauma.
• Persistent beliefs about oneself as diminished, defeated or worthless, accompanied by deep and pervasive feelings of shame, guilt, or failure related to the traumatic event.
• Persistent difficulties in sustaining relationships and in feeling close to others.

Not everyone who experiences complex trauma will develop C-PTSD, but those who have prolonged and repeated traumatic experiences are more likely to develop symptoms that go beyond those of PTSD, which might lead to a C-PTSD diagnosis.

As always, individual differences, resilience factors, and the availability of supportive relationships and environments can also influence whether a person will develop C-PTSD following complex trauma. It is important to note that a mental health professional should make such diagnoses.