borderline personality disorder

They love you one minute and hate you the next. They seem to cause trouble in all their relationships. They’ll go from sweet and loving to furious and lashing out. Yup. That’s life when a loved one has borderline personality disorder or BPD. Today I’m going to explain what BPD is exactly and the top ways you can help others and yourself. So stay tuned!

9-minute read

Before we get going, I’ve got to give you some caveats:

  • Do not diagnose loved ones! If you think someone you love falls into this category, do everything in your power to have them assessed by a trained mental health professional!
  • If someone you love has definitively been diagnosed with BPD, do your best to get consistent professional support for yourself.

What Exactly is a Personality Disorder?

I’ve talked about personality disorders a little on the podcast, but as always, I want to give you a clear understanding of what they are. Personality disorders are different than the more commonly talked about mood disorders like depression and anxiety in one significant way: Personality disorders, at their core, are about the ways people relate to themselves and other people, while mood disorders are about patterns in people’s emotions.

There are four main defining features of personality disorders:

  1. Difficulty with emotional regulation (problematic emotional responses)
  2. Distorted thinking patterns
  3. Rocky interpersonal relationships and problems
  4. Under or over-regulated impulse control

These four qualities combine in different ways to form the ten personality disorders identified in the Diagnostic and Statistical Manual of Mental Disorders, known as the DSM-5-TR (meaning fifth edition, text revision). This is the big book we use to diagnose mental health disorders.

These ten different personality disorders are grouped into three clusters:

  • Cluster A: known as the odd, eccentric cluster, this includes Paranoid, Schizoid, and Schizotypal Personality Disorders. Common among these diagnoses are social awkwardness and withdrawal. These disorders are dominated by distorted thinking.
  • Cluster B: known as the dramatic, emotional, erratic cluster, includes Borderline and Narcissistic personality disorder, among others. I’m telling you this here because someone with Borderline can be easily misdiagnosed as being Narcissistic. All these disorders are dominated by problems with impulse control and emotional regulation.
  • Cluster C: known as the anxious, fearful cluster includes, Avoidant, Dependent, and Obsessive-Compulsive Personality Disorders. The dominant features of these personality disorders are a high level of anxiety.

What is Borderline Personality Disorder?

People with Borderline Personality Disorder (or BPD) have a hard time regulating their emotions and feel them more intensely and for longer periods of time. Because of this, they have a hard time coming back to “normal” once they’ve been triggered by something. About 1.6% of adults in the United States (about 4 million people) have BPD, with almost 75% being women. More recent research suggests that men are likely equally affected by BPD but are misdiagnosed with PTSD or depression.

Since this podcast is heard in over 170 countries, I couldn’t look up statistics everywhere, but I looked up a few for perspective. Canada is very similar to the US, with an estimated 1% to 2% of people (mostly women) being diagnosed. In Australia, the numbers are between 2 and 6%, with that same majority of women being diagnosed, and in Great Britain, the numbers are also similar, coming in at 4.4%, yet again with the majority of those diagnosed being women.

Symptoms of Borderline Personality Disorder

There are a few specific characteristics of people with BPD. While someone might not have all of these, they will have at least three if this is an official diagnosis.

  • Intense relationships with lots of conflict and instability (that they often seem to create)
  • Viewing things in extremes from all good to all bad. They can go from loving you to hating you in 5 minutes.
  • Self-harm, cutting, suicide attempts, or threats
  • An intense fear of abandonment (no one can do enough for them; getting deep into a relationship quickly)
  • Major changes in self-identity and self-image which often shows up as rapidly shifting goals, values or seeing themselves as horrible or invisible.
  • Impulsive, risky behavior, such as drug and alcohol abuse, eating disorders, gambling, unsafe sex, or spending sprees. Please note: If these behaviors happen mostly during times of elevated mood or energy, they may be symptoms of a mood disorder and not borderline personality disorder.
  • Ending things impulsively, like leaving a great job or a happy relationship
  • Mood swings lasting from a few hours to a few days which can include rage and lashing out, intense happiness, low feelings of shame or anxiety
  • Feelings of dissociation and feeling cut off from their body, or feelings of unreality.

Some of the other things I commonly see with this diagnosis include:

  • History of suicide attempts, threats, cutting, or hospitalizations
  • Lots of job changes or getting fired/laid off
  • Starting but not completing things like a degree, interest in a kind of job, projects around the house
  • Conflict-filled relationships
  • Chaos in their life, including abortions or unplanned pregnancies, accidents, fights, sexually transmitted diseases, physical issues, or chronic pain

What Causes BPD?

We don’t know what exactly causes BPD, but there are some main contributing factors:

  1. Genetics: You’re at higher risk of any mental disorder if someone in your family has had it.
  2. Environmental Factors: A stressful childhood, abuse, or neglect are associated with BPD. This can be anything from being separated from a parent when you were young, to sexual abuse, to having a caregiver who was a drug addict or had other mental health issues.
  3. Brain abnormalities: Research has shown differences in certain areas of the brain involved in emotion regulation, impulsivity, and aggression, along with evidence of neurotransmitters not functioning properly. The problem is that these studies can’t tell if these differences were risk factors for BPD (so already there) or if these brain changes were caused by having BPD.

BPD in Relationships

People with BPD tend to view the world in black-and-white or all-or-nothing thinking. When they do this, they easily misinterpret and misunderstand the words, feelings, actions, and motivations of other people. As they see the world this way, they have intense emotional reactions (remember, we feel the way we think) and then have a hard time regulating these feelings. The more they can’t regulate how they’re feeling, the more upset they become, which often leads to self-destructive and impulsive behaviors. When they do this, their skewed thinking actually becomes a self-fulfilling prophecy.

For example, about a year ago, I was working with a client whose wife has BPD. He’d been having some heart palpitations and other symptoms but didn’t want to tell his wife before he went to the doctor to find out what was going on because he didn’t want to deal with her upset and overreactions. Because he was worried about his health, he’d been acting a little distant and quiet. She noticed, of course, and started to spin. She accused him of cheating. At this point, he admitted that it was a health thing, but now she didn’t believe him and thought he was lying to cover up the cheating. Over the next few months, she followed him around, breaking into his phone and email accounts and stalking his social media. He got so sick of her behavior that he did, in fact, finally choose to leave.

How Can I Help Someone Struggling with BPD?

First and foremost, I’m going to tell you that there’s little you can do on your own to help someone struggling with BPD. Your best bet is to figure out a way to get them to a professional trained in helping someone with BPD. There is one main type of therapy that’s been proven effective for borderline personality disorder, and that’s something called Dialectical Behavior Therapy or DBT. In fact, it was specifically developed to treat people with borderline personality disorder.

DBT was developed by psychologist Marsha Linehan in the 1970s and is a type of talk therapy based on cognitive behavioral therapy (CBT). CBT helps people understand how their thoughts affect their feelings and subsequent actions. It helps people reframe what they’re thinking in a new light so they can feel differently (because we feel the way we think). Dialectical means combining opposite ideas. DBT focuses on helping people accept their reality while seeing it in a new light so they can change and better regulate their unhealthy emotions and impulses. DBT is basically a skills training that’s mostly done in groups, but therapists can be trained to work with people individually too.

The training is focused on four main skills:

  1. Mindfulness: staying fully aware and focused in the present moment instead of worrying about the past or being anxious about the future
  2. Distress tolerance: Learning how to manage and understand emotions that crop up in stressful situations without responding with a harmful or unhealthy behavior
  3. Interpersonal effectiveness: Understanding how to ask for what you need, set boundaries, and being respectful of yourself and others
  4. Emotional regulation: Understanding, awareness, and control over emotions

What you can do on your own to help:

As I said, getting professional help is top of the list when it comes to truly helping someone with BPD. Having said that, there are some things you can do. First and foremost is to have strong, clear, consistent boundaries. A person with BPD can be all over the place, so it’s important that you’re not reacting to them. Some days they’ll praise you, and the next, they might lash out in anger. Your job is to make sure that the tail doesn’t wag the dog. You want to be the one leading in the relationship, not them.  No matter how they act, you’re the steady ship with clear and consistent responses to any unhealthy behavior you see in them.

The next thing you can do is learn about BPD as well as the basics of DBT. If a person you loved had cancer, you’d likely learn all you could and understand the treatments offered so you could converse knowingly with them and support them in their decision-making. This same strategy should apply to mental illness, not just physical illness. Lastly, (as I stated earlier) get support and counseling for yourself. The stronger you are and the more able you are to be supportive while holding consistent boundaries, the better off they’ll be.

Resources for How to Cope When a Loved One has Borderline Personality Disorder

Boundaries: How to Identify Them and How to Hold Them

The Secret to Positive Thinking in All of Your Relationships

The Secret to Making Boundaries Not Walls (So You Can Feel Safe)

For more quick tips, subscribe to my YouTube channel


References and abstracts from MEDLINE/PubMed (National Library of Medicine)

Chapman J, Jamil RT, Fleisher C. Borderline Personality Disorder. [Updated 2022 May 2]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2022 Jan.

“Personality Disorders,” National Institute of Mental Health

“Borderline Personality Disorder,” Canadian Mental Health Association

“About BPD,” NEAPBD Australia:

Paul H. Soloff, Patrick Pruitt, Mohit Sharma, Jacqueline Radwan, Richard White, Vaibhav A. Diwadkar, Structural brain abnormalities and suicidal behavior in borderline personality disorder, Journal of Psychiatric Research, Volume 46, Issue 4, 2012, Pages 516-525

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