CPTSD vs. BPD: How they’re similar and where they differ

What is CPTSD?

Complex PTSD (CPTSD) is a trauma-related condition that includes many of the symptoms of PTSD in addition to lasting problems with emotions, self-image, and relationships. It’s most often linked to trauma that was prolonged or repeated and hard to escape.

CPTSD is not quite as established as some other diagnoses. “It is a very new term,” says Nakisha Rodriguez, LCMHCS, a licensed clinical mental health counselor at Thriveworks, noting that it hasn’t been included in the latest edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5-TR). It does, however, appear in the International Classification of Diseases (ICD-11), the diagnostic manual created by the World Health Organization (WHO).

The diagnosis of CPTSD was first proposed by clinician and researcher Judith Herman in 1992, who argued that the standard PTSD criteria captured single events (like combat) well, but missed the effects of long-term, repetitive trauma.

“The classic PTSD diagnosis is meant for specific traumatic events,” explains psychologist Aimee Daramus, Psy.D. (For instance, a severe weather event, fighting in a war, or experiencing an assault.) “With complex PTSD, it’s not related to any one specific event. It’s basically a traumatic lifestyle,” Dr. Daramus says, “an ongoing situation you can’t get away from.”

According to the National Center for PTSD at the U.S. Department of Veterans Affairs, CPTSD is more often related to “early repeated interpersonal trauma.” That might include physically abusive parents, a toxic family environment, growing up in severe poverty or in a dangerous neighborhood, or being in an emotionally or sexually abusive relationship. (An important note here is that trauma is about how severely the experience affects the person, not how severe it looks to somebody else. “If that person considers it trauma, it’s traumatic,” Rodriguez says.)

According to the ICD-11 definition, a diagnosis of CPTSD starts with meeting the core criteria for PTSD, which includes experiencing all three of the below symptoms for at least several weeks:

• Re-experiencing the trauma in the present: Like intrusive memories, flashbacks, or nightmares, often coupled with feelings of fear or horror, strong physical sensations, or the same overwhelming emotions they felt during the events
• Avoiding reminders of the trauma: That includes certain thoughts, memories, people, activities, and situations
• A heightened sense of threat: Such as hypervigilance or startle reactions

In addition to those criteria, there is also a distinct set of symptoms unique to CPTSD, described as “disturbances in self-organization”:

• Serious problems with mood regulation: Like heightened emotional reactivity to minor stressors, self-destructive behavior, dissociating under stress, emotional numbing, and difficulty experiencing positive feelings
• Negative self-beliefs: Seeing yourself as diminished, defeated or worthless, or having deep feelings of shame or guilt related to the traumatic stressor
• Challenges sustaining close relationships: Avoiding relationships and social engagement, struggling to feel close to people, or intense but not sustained relationships.

These symptoms also have to result in significant difficulties in functioning (such as personally, socially, at school, at work, or with family), Rodriguez says.

While CPTSD doesn’t have its own entry in the DSM, the authors of the DSM have expanded the criteria for PTSD to capture some of the symptoms thought to be associated with CPTSD, including: inappropriate self-blame, persistent negative mood, irritation or aggression, and impulsive or self-destructive behavior.

What is BPD?

Borderline personality disorder (BPD) is a mental health condition marked by intense, shifting emotions, an unstable sense of self, turbulent relationships, and difficulty functioning.

BPD is a personality disorder that strongly impacts how people feel about themselves and others. “A personality disorder is just when your own natural personality traits get so big, so extreme, and out of control that it becomes damaging,” Dr. Daramus explains.

A hallmark of BPD is trouble regulating emotions. “The emotions can spike very, very quickly over things that would not really make most people mad or sad,” Dr. Daramus says. This emotional dysregulation can lead to a pattern of impulsive behavior, an often changing sense of self, and challenges in maintaining stable relationships, according to the National Institute of Mental Health (NIMH).

The exact causes of personality disorders like BPD aren’t fully understood, but they are thought to be caused by both genetic and environmental factors. The NIMH points to a mix of genetics and family history, differences in brain structure and function, and environmental and social factors—including childhood trauma. That can include abuse, neglect, abandonment, and mistreatment, as well as unstable, invalidating, or conflict-filled relationships.

So how does trauma come into play with BPD? According to Dr. Daramus, who works with people with BPD, trauma can trigger someone’s natural predispositions, causing certain personality traits to move toward the more extreme end of the spectrum and become problematic. “If they had had a healthier [environment] when they were young, they might not have developed borderline personality disorder,” Dr. Daramus says.

According to the DSM-5-TR, a diagnosis of BPD requires a lasting pattern of relationship instability, issues with self-image, and impulsivity beginning in early adulthood and showing up across a variety of contexts, as well as at least five of the following symptoms:

• Frantic efforts to avoid real or imagined abandonment
• A pattern of unstable and intense interpersonal relationships
• Significant and persistently unstable sense of self
• Impulsivity that’s potentially self-destructive (in at least two areas, like spending money, sex, substance abuse, binge eating, or reckless driving)
• Recurrent suicidal behavior or threats, or self harming behavior
• Mood instability and emotional reactivity (like intense episodes of negative emotions, irritability, or anxiety)
• Chronic feelings of emptiness
• Inappropriate, intense, or hard-to-control anger
• Temporary paranoid thinking related to stress, or serious symptoms of dissociation

CPTSD vs. BPD: How are they similar and how are they different?

“They both have a few things in common—like emotional dysregulation, and that both of them can be associated with trauma,” Dr. Daramus says. Difficulties with self-image and relationships are also common in both.

Read more: How childhood trauma affects adults relationships

Despite these similarities, there are very real differences between the two conditions. And “even when the behaviors are similar, it’s often for different reasons,” Dr. Daramus explains.

One core distinction is the underlying drive that causes many of the symptoms, especially those that show up in relational situations. People with CPTSD are primarily seeking safety in relationships, while people with BPD are seeking stability and to avoid being abandoned. “That would be one of the big distinguishing factors,” Dr. Daramus says.

How CPTSD and BPD are similar

• They both feature emotional dysregulation: A core feature of both conditions, Dr. Daramus defines this as “when your emotions are triggered faster and more strongly than would be considered normal.”
• Early trauma is often present in both: While trauma isn’t a diagnostic requirement for BPD, Dr. Daramus notes that both disorders are often influenced by a person’s upbringing, especially if it was a dysfunctional one.
• They both have difficulties with self image: A negative or unstable sense of self is a symptom of both conditions.
• They both can experience dissociation: This feels like a sense of detaching from yourself or your surroundings.
• They both have unstable relationships: It’s a core component of both conditions, but the underlying reasonings can differ.

How CPTSD and BPD are different

• Trauma is a requirement for CPTSD, but not for BPD: Trauma is a common risk factor for BPD, not a requirement the way it is with CPTSD.
• Emotions often are more intense with BPD: Emotional dysregulation can show up in both. But “people with CPTSD don’t always have the big, big emotions that people with borderline do,” Dr. Daramus says.
• The conditions affect someone’s sense of self in different ways: A key component of BPD is that people “don’t really have one strong sense of self,” Dr. Daramus says. With CPTSD, the self-image is consistently negative.
• What they’re seeking in relationships often differs: “People with borderline want stable relationships, but they also want excitement,” Dr. Daramus says. “People with CPTSD are just seeking safety.”
• The causes of their relationship instability are very different: Someone with CPTSD often tries to manage their trauma by seeking safe situations—like by avoiding relationships or seeking out partnerships that feel familiar. But they may unconsciously be drawn to traumatic situations that mirror their upbringing, Dr. Daramus explains. Someone with BPD, on the other hand, may struggle here due to heightened emotional reactivity, impulsivity, black-and-white thinking, dramatic swings in how they see the other person, and frantic efforts to avoid abandonment.

Why CPTSD and BPD are so often confused

The two conditions can appear to resemble each other so much that researchers have been debating for years whether what we call CPTSD could potentially be PTSD co-occurring with BPD. But ultimately, the data show that there are distinct differences.

Along with the overlapping presentation and shared history of trauma, stigma may be another reason for confusion—particularly if someone feels more comfortable with a diagnosis of CPTSD than they do with a personality disorder.

“Trauma tends to bring out a little more sympathy in a lot of people,” Dr. Daramus explains. BPD, on the other hand, can carry more judgment, even though people with BPD have often experienced trauma too. “It might be difficult for the average person to understand that the person with borderline has had a lot of bad things happen to them,” Dr. Daramus says.

How providers tell the difference between CPTSD and BPD

Mental health professionals are trained to look beyond the surface similarities of two conditions. With some digging into the nuances—the underlying beliefs, the inner experiences of the person, their history, and the full spectrum of symptoms—the distinction becomes pretty clear.

While there’s no single giveaway, Dr. Daramus often listens for a few core themes when discussing a patient’s symptoms. The underlying drive in CPTSD is seeking safety, whereas the core theme in BPD is avoiding abandonment.

“Somebody with borderline personality disorder might talk more about difficulties in their relationships, whereas with somebody with CPTSD, I might pick up more on themes of fear and safety,” she says.

Another helpful indicator in some cases can be medication—including what medications they’re taking or have taken in the past, and how well they’ve worked or not. “Sometimes that will give me a hint as to which one it is,” Dr. Daramus says.

Can you have both CPTSD and BPD?

“Absolutely,” Rodriguez says. “You can have one or the other, and you can have both.”

People with BPD are actually more likely to experience symptoms of several other disorders, according to the NIMH, including PTSD, depression, anxiety, and others.

It’s hard to know how common this is, but in one 2025 study of 292 people with probable personality disorder, half met the diagnostic criteria for both CPTSD and BPD.

When someone is diagnosed with both CPTSD and BPD, their treatment plan would include approaches for both conditions and be individually tailored to their symptoms, challenges, and needs, Rodriguez says.

How are CPTSD and BPD diagnosed?

A mental health provider can diagnose either condition through a clinical interview that reviews your symptoms, experience, and history, sometimes with the help of standardized questionnaires.

Seeing a professional is crucial here because self-diagnosis has its limits. While online quizzes, chatbots, and even articles like this can point you toward a possibility, they can’t provide the expertise and personalized approach that a trained clinician can.

How are CPTSD and BPD treated?

Both conditions are highly treatable, and there’s a decent amount of overlap in the approach.

Therapy is a primary component of treating both conditions, Rodriguez says, noting that cognitive behavioral therapy (CBT) and dialectical behavior therapy (DBT) can support people with either condition. CBT can help challenge unhelpful thought patterns and beliefs, while DBT can ease emotional reactivity/dysregulation and improve relations with others. Group support is also known to be helpful for both conditions, Rodriguez says.

Medication can also play a role in managing certain symptoms of either condition, which we’ll get into in a bit.

Therapy for CPTSD

Along with CBT and DBT, Rodriguez highlights these options for CPTSD—largely trauma-focused therapies that can help reduce or eliminate the effect of triggering material.

• Cognitive processing therapy (CPT): “You’re essentially processing what the trauma was,” Rodriguez says.
• Prolonged exposure (PE) therapy: This involves gradually facing trauma memories and reminders
• EMDR (Eye Movement Desensitization and Reprocessing): “We are trying to change the way your brain codes a traumatic event,” Rodriguez says.

Because CPTSD isn’t listed in the DSM, much of the evidence we have on treatment comes from PTSD, Rodriguez points out. The American Psychological Association’s PTSD guideline recommends trauma-focused CBT, cognitive processing therapy, and prolonged exposure therapy for first-line treatment, along with several other approaches (including EMDR) as second-line treatments.

Therapy for BPD

Talk therapy is the backbone of treatment for BPD, Rodriguez says. She points to two modalities in particular, which the NIMH also highlights:

• DBT: This is the go-to therapy for BPD, Rodriguez says. It was actually developed specifically for BPD. As the NIMH explains, this approach leans on mindfulness and teaches valuable skills that can help people with BPD regulate emotional intensity, enhance their relationships, and mitigate self-destructive behaviors (like impulsivity or self-harm). It can also help patients see other perspectives and question the leaps behind their conclusions, Rodriguez says.
• CBT: This modality can help people recognize and shift the core beliefs and behavior patterns that stem from skewed perceptions of themselves and other people, as well as reduce mood swings and self-harming behaviors, per the NIMH.

One review of 25 studies found that numerous other types of therapy were helpful in addition to DBT and CBT, including: schema therapy (which targets unhelpful thinking patterns and beliefs), transference-focused psychotherapy (which uses the relationship with the therapist to work on sense of self and relationships), and acceptance and commitment therapy (focused on accepting difficult thoughts and emotions and taking aligned actions). Group work can also be powerful for BPD.

Medications for CPTSD and BPD

For CPTSD, antidepressants may be prescribed to help with mood regulation (or co-occurring depression), Rodriguez says. APA guidelines for PTSD treatment conditionally recommend several antidepressants (fluoxetine, paroxetine, sertraline, and venlafaxine) as a second-line treatment. If insomnia and hypervigilance are issues, sleep medications might also be used, Rodriguez adds.

For BPD, medication isn’t a first-line treatment. According to the NIMH, “the benefits of medication for borderline personality disorder are unclear.” But if your therapist thinks medication could be helpful to target specific symptoms—or co-occurring conditions like depression—they will recommend you see a psychiatric provider, Rodriguez says. Those medications might include a mood stabilizer or an antidepressant, Rodriguez says, which can help regulate emotions and improve mood so that a patient can feel more stable and learn coping skills in therapy.

Finding support for CPTSD or BPD

If you think you might have CPTSD or BPD, reach out for support. Start with a therapist, a medication evaluation, or both.

“Definitely seek a therapist and/or get a medication evaluation,” Rodriguez says. A professional can go over your history, current experience, and symptoms. Together, you’ll get to the bottom of what’s going on and land on a diagnosis—or make sure you feel confident in one you already have.

They’ll also work with you to create a treatment plan that tackles your symptoms, so you can start feeling better. With proper treatment, people with CPTSD and BPD can live a full and healthy life, Rodriguez says.