Complex trauma is often misunderstood or seen as a vague and confusing description for what someone has gone through. Most people associate trauma with a singular event like a car accident, an assault, a natural disaster, a traumatic loss. It's perceived as something you know happened, a moment you can point to where your life changed.
Complex trauma is different because it doesn't feel tied to one memory or experience. It usually develops over time in childhood through repeated painful experiences, fear, invalidation, boundary violations, and abandonment or rejection. It can also come from prolonged trauma in adulthood, such as through years of domestic violence. It's often the result of growing up in an environment where emotional needs weren’t met, where love felt conditional or unpredictable, where conflict was always around the corner, where fear was a huge motivator, where boundaries were consistently disrespected or blurred, or where a caregiver was physically or emotionally absent.
It can also be less obvious, like when a parent is chronically depressed or so anxious they can't be present and attuned. This is sometimes called childhood emotional neglect, where a child's needs are met materially but not emotionally. Complex trauma can also come from repeated physical, sexual, or emotional abuse by a sibling, cousin, aunt or uncle, another family member, or someone in the community.
One of the most challenging aspects of complex trauma is that it often leaves you believing nothing was wrong and nothing bad happened. You see it as just the way things were because it was your "normal" and you don't have much to compare it to.
Is complex trauma the same as complex PTSD?
Complex trauma and complex PTSD are often used interchangeably. Here’s the difference: complex trauma describes what happened (repeated, relational harm over time, usually early in life), while complex PTSD (C-PTSD) describes how the trauma manifests in your internal and external life.
The World Health Organization (WHO) formally recognized complex PTSD in its diagnostic manual, the ICD-11. It describes complex PTSD as the core symptoms of PTSD (reliving, avoiding, and a constant feeling of being under threat) plus three additional areas of difficulty: regulating emotions, a deeply negative sense of self, and trouble in relationships. The second set is what makes it “complex,” and as you can see it's not just about specific memories. It’s also about how you learned to feel, see yourself, and relate to others throughout your life. Not everyone with a history of complex trauma meets the criteria for C-PTSD, but they often do overlap.
How complex trauma can look in adulthood
What I find is that most adults with complex trauma don't come to therapy saying, "I want to work on my complex trauma." They usually describe a bunch of challenges like, for example, repeating the same patterns in relationships, feeling like something is wrong with them, being constantly exhausted, feeling numb or disconnected, people pleasing, or feeling like a failure regardless of what they've accomplished.
Many struggle to identify and express their feelings or, alternatively, feel so intensely that it's hard to regulate their emotions. This often has interpersonal and professional consequences. Your partner might want more emotional connection from you, or want you to be able to share your feelings less explosively or impulsively. You might be left frustrated with yourself for not managing it no matter how hard you try.
The 17 symptoms of complex PTSD
You may have seen lists of “the 17 signs” or "the 17 symptoms” of complex PTSD. There isn't an official list, and different sources count differently. What follows are 17 ways complex PTSD commonly shows up, loosely grouped around the ICD-11's structure. Some are part of the formal criteria; others are patterns I see often in practice. Each one began as a way of adapting to something that once felt unsafe.
Reliving and bracing
Intrusive memories or flashbacks. These aren't always images. Often they're sudden waves of fear, shame, or helplessness with no obvious trigger.
Avoidance. Staying away from people, places, conversations, or feelings that stir something up, sometimes without realizing you're doing it.
Hypervigilance. Scanning faces, tone, and silence for signs that something is about to go wrong.
A constant sense of threat. A body that stays braced, showing up as constant tension, being startled easily, or feeling unable to really relax.
Sleep problems. Trouble falling asleep, waking in the night, or never waking up rested.
Feeling too much, or too little
Emotions that feel overwhelming. Reactions that seem out of proportion to the moment, then feeling really embarrassed about them.
Emotional numbness. Going through the motions, or feeling empty even when things look fine on paper.
Dissociation. Feeling foggy, far away, or disconnected from your body, especially under stress.
Irritability or anger. Often protecting something more vulnerable underneath, like hurt or fear.
How you see yourself
Chronic shame. A sense that the problem is you, not what happened to you.
Feeling fundamentally flawed. A belief that you're broken, too much, or not enough.
A harsh inner critic. Relentless self-judgment, perfectionism, or never feeling like you've done enough.
Misplaced guilt. Feeling responsible for other people's emotions, or for things that were never in your control.
Relationships
Difficulty trusting. Expecting to be hurt, manipulated, or let down, or trusting the wrong people because warning signals are hard to read.
People pleasing. Reading the room and becoming whoever keeps things calm, at the cost of your own needs.
Pulling away. Needing distance as soon as you start to get closer to someone, or self-isolating even when you're lonely. When wanting closeness and fearing it happen at the same time, it’s sometimes called a disorganized attachment style.
Repeating painful patterns. Finding yourself in familiar dynamics with partners, friends, or colleagues, even when you try really hard to avoid it.
If several of these sound familiar, it doesn't mean you have a diagnosis. It may mean some of what you've been struggling with has a history, that it makes more sense than you've been giving it credit for, and it’s worth exploring.
What makes complex trauma hard to recognize
Someone who has experienced complex trauma has often internalized certain beliefs about themselves and the world. Your sense of self is organized around these beliefs, and they shape the lens you see everything through. A lot of the time, these are painful experiences that aren't remembered as “traumatic.”
This often leads people with complex trauma to blame themselves and tell themselves the real problem is that they don't try hard enough, they're too sensitive or reactive, or there's just something wrong with them. It can be surprising to hear that these patterns are because of what happened to them rather than an inherent personality flaw.
All of this can be misunderstood by the person, by others, and sometimes even by clinicians, as depression, anxiety, personality issues, or just "the way I am." Because complex trauma doesn't have one clear cause, it's easy to minimize. People often think, "Nothing bad happened to me," or "Other people have been through real trauma and I don’t have a right to feel this way."
I often notice this in sessions. A client will mention something in passing, like a memory of crying as a kid while their parent just sat there and didn't do anything, and they'll say it as casually as if they were describing the weather. Meanwhile my eyebrows are up or my jaw has dropped, and sometimes the client does a double take and asks about my reaction. I'll ask what they feel as they say it, and usually the answer is nothing. So I might ask them to imagine themselves as that child, crying, and to notice what it's like to have their parent sitting right there and not doing anything. That might be the first time something starts to come through, maybe a sadness, anger, or just a conviction that this shouldn't have happened to them.
The truth is that complex trauma isn't about an external measure of how bad things were. It's about how you learned to adapt to an environment that required you to respond in particular ways. Those adaptations made sense in childhood, and they continue into adulthood even though you're no longer in that environment. It’s like an operating system that has yet to be updated.
Another reason it's hard to recognize is that many people with trauma histories are highly functional and professionally accomplished. From the outside, no one would guess what they've been through, yet something feels off in their relationship to others and themselves.
Therapy for complex trauma
Healing from complex trauma begins with a safe and trusting relationship with a therapist. Many people with complex trauma have experienced relationships as a source of pain instead of comfort, but the therapy relationship can offer something different. It’s a place where you can be known without judgment, experience rupture and repair, and slowly recognize safety in relationships is genuinely possible.
Much of this work happens relationally, as patterns that developed in response to early experiences enter the therapy room. We pay attention to how you relate to me, what you expect from me, and when you pull away or move closer. These moments become windows into deeper understanding and new ways of relating.
We also pay attention to the parts of you that developed to keep you safe but may no longer serve you the way they used to. There may be a part that shuts down, a part that's always on alert, a part that never asks for anything, or a part that works hard to avoid being seen negatively. You can develop a relationship with those parts instead of feeling taken over by them. For many people, inner child work becomes a big part of this, as they start relating to that younger version of themselves with the care and attention they didn't get at the time.
Complex trauma lives not just in memory and thought, but in the body. You might have chronic tension, numbness, disconnection, high alertness, or constant fatigue. Slowly and carefully, we work to reconnect body and mind. For some people, this eventually includes EMDR to help specific memories lose their charge.
Is complex PTSD in the DSM?
Complex PTSD is not in the DSM as a separate diagnosis. The DSM-5-TR, the manual most U.S. clinicians use, includes PTSD but not complex PTSD. The ICD-11 does. In practice, many clinicians recognize and treat complex trauma regardless of which label appears in the paperwork.
Can complex PTSD be cured?
I generally don’t use the word “cured” when thinking about treatment of complex PTSD. However, people do meaningfully heal and slowly notice real changes in their life. Over time, the nervous system can settle, shame can weaken its hold, and relationships can start to feel safer. It doesn’t happen overnight, but the recurring patterns can become less automatic and less in charge.
How many EMDR sessions does complex PTSD take?
There's no set number of sessions when it comes to EMDR for complex PTSD. With complex trauma, EMDR usually comes after a period of building stability and trust, and the processing itself tends to take longer than it does for a single-incident trauma. I don't typically begin EMDR early in the work, because it works best when there's a steady foundation to return to.
This work takes time, but it tends to create change that lasts. If you're looking for a trauma therapist in NYC, or across New York and Florida, I'd welcome the chance to connect.
Sources
World Health Organization. International Classification of Diseases, 11th Revision (ICD-11), 6B41 Complex post-traumatic stress disorder.
American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR), 2022.
Maercker, A., et al. "Complex post-traumatic stress disorder." The Lancet, 2022.
