The difference between BPD vs bipolar disorder is BPD features rapid, reactive mood swings triggered by relationships and fear of abandonment, while bipolar involves prolonged episodic highs (mania) and lows unrelated to external events.
Professional psychological testing & evaluation can determine between for official diagnosis purposes.
Medically reviewed by Andrew Crawford, Registered Psychological Associate.
Last updated: May 25, 2026
Time to read: ~27 minutes
BPD, a personality disorder, centers on chronic instability in self-image, intense but unstable relationships, and emotional dysregulation that shifts within hours or days.
Bipolar disorder, a mood disorder, features distinct manic or hypomanic episodes lasting days to weeks, often with elevated energy and reduced sleep need, followed by depressive phases.
To better map symptoms to one or the other, try: BPD Self-Test.
BPD and bipolar disorder both involve mood instability but differ fundamentally as a personality disorder versus a mood disorder.
BPD mood swings last hours to days and shift rapidly within a single day. Bipolar episodes persist for days (hypomania), weeks (mania), or months (depression).
BPD moods react intensely to interpersonal stressors like rejection or abandonment fears. Bipolar episodes arise more spontaneously, often tied to biological factors like sleep disruption rather than external events.
BPD centers on unstable self-image, fear of abandonment, and chaotic relationships with splitting (all-good/all-bad views). Bipolar revolves around cyclical mania/hypomania and depression affecting energy, cognition, and functioning.
Bipolar disorder is biologically driven and medication (like Lithium) is the primary “first-line” defense. BPD is psychologically/relationally driven. DBT, Transference-Focused Psychotherapy (TFP), and/or Mentalization-Based Therapy (MBT) can help.
Learn more about our residential program for bipolar disorder, which is another form treatment can take for the condition.
Some additional differences between BPD vs bipolar include:
Self-Harm/Suicidality: More chronic and frequent in BPD (75% attempt suicide); episodic in bipolar.
Onset/Pattern: BPD symptoms persist daily with brief wellness; bipolar has distinct episodes and euthymic periods.
| Aspect | BPD | Bipolar |
|---|---|---|
| Mood Duration | Hours-days | Days-months |
| Triggers | Interpersonal stressors | Biological/sleep changes |
| Core Issues | Identity/relationships | Mania-depression cycles |
| Treatments | Therapeutic modalities | Medication management |
| Outlook | May resolve over time | A lifelong affliction |
Borderline Personality Disorder (BPD) is a type of mental health disorder that affects how you function in everyday life. It changes the way that you think about both yourself and others.
In a USA community sample, 0.7 – 2.7% of individuals were diagnosed with BPD, with only slightly higher rates for women compared to men.
Common BPD traits include self-image issues, unstable relationships, and trouble managing your emotions.
People struggling with BPD have a deep fear of instability or abandonment. This can lead to issues in relationships with a BPD partner.
Worse yet, despite their fear of being alone, people suffering from BPD often end up pushing others away. Even though they want to have lasting and loving relationships, their mood swings make it difficult for them to do so.
Most people struggling with BPD begin showing signs and symptoms in early adulthood. It tends to get better as a person ages and to have the most intense symptoms during their young adulthood.
While BPD is certainly a serious disorder, it can be treated. Many people who struggle with this illness learn to cope and to get better over time. They are still able to live healthy and fulfilling lives.
If you are struggling, residential treatment for BPD is available to help.
The four subtypes of Borderline Personality Disorder (BPD)—Discouraged (Quiet), Impulsive, Petulant, and Self-Destructive—stem from clinical observations by Theodore Millon, though not officially in the DSM-5. They include:
Individuals appear compliant and avoidant outwardly but suffer intense internal turmoil, self-loathing, and fear of abandonment. People with quiet BPD internalize pain through self-blame, shame, and covert self-harm like starvation, often seeking approval to mask emptiness.
Marked by reckless, thrill-seeking behaviors like substance abuse, spending sprees, or unsafe sex, driven by urgent needs to escape emotional voids. Relationships are unstable due to rapid idealization-devaluation cycles and poor self-image.
Characterized by irritability, defiance, and explosive anger, often playing the victim with manipulative or passive-aggressive tactics. Unstable moods lead to tantrums, entitlement, and fear-driven clinginess amid perceived rejection.
Focuses on chronic self-sabotage, severe dysphoria, and self-loathing through repeated self-harm, suicidality, or disruptions like job loss. Exhaustion and defeatism dominate, with little outward aggression but profound internal defeat.
Borderline Personality Disorder is characterized by several main symptoms. These symptoms include:
Because people struggling with BPD tend to show signs of impulsive and risky behavior, it can lead them to engage in addictive activities. These include gambling, alcohol consumption, or drug use.
What’s worse is that many symptoms of BPD are triggered by interactions with institutions or individuals. Stressful or traumatic events can also lead to an outburst of BPD symptoms.
Another symptom of Borderline Personality Disorder is something called splitting. Splitting is a term used to describe a person’s inability to hold emotionally opposing viewpoints.
These viewpoints could be surrounding themselves or other people. Most often, the viewpoints are defense mechanisms to help the individual with their fear of abandonment.
Splitting is dangerous because it can lead to risky and impulsive behaviors. This can put the individual in harm’s way.
While there is no exact answer as to what causes BPD, research suggests that people develop this disease due to environmental factors. Many times those factors are experienced during childhood.
Environmental Factors
A few experiences that can cause BPD include physical, sexual, or emotional abuse. Parental neglect or substance abuse can also lead to the development of BPD in children.
Children who experience emotional trauma and stress in their youth may struggle to manage their emotions later in life. This can ultimately end up leading to the development of BPD.
Biological Factors
Experiences aren’t the only factors that cause BPD, either. Brain structure, genetics, and chemical imbalances can all lead to BPD as well.
Individuals who have a family history of Borderline Personality Disorder are more likely to develop this illness themselves. And, people who struggle with decreased levels of serotonin may also develop this illness.
Interestingly enough, people who suffer from BPD often have altered neurotransmitter function in the brain. They may experience structural changes in the orbitofrontal cortex, amygdala, and hippocampus.
If you suspect that you or a loved one is struggling with BPD, you’ll want to get a diagnosis. To get a diagnosis, you will need to visit a licensed mental health professional.
A mental health professional will ask a series of questions and observe behaviors to make a diagnosis. In order to be diagnosed with BPD, the individual must display five or more symptoms.
These symptoms include some of the following BPD attributes:
If you or someone you know is experiencing multiple instances of the above symptoms, it could mean that BPD is to blame. Getting an appropriate diagnosis from a healthcare professional will help you get treatment.
If you or someone you love is diagnosed with BPD, it’s important to seek treatment. Luckily, there are several treatment options available for people struggling with this issue.
The most common type of treatment for those dealing with BPD is psychotherapy. Psychotherapy can be delivered using one of two methods:
Aside from therapy, some doctors choose to prescribe medication for this issue. While the benefits for BPD itself are not entirely clear, medicine can help combat some of the symptoms of the disease.
For example, medication can help with depression, mood swings, anxiety, and other mental disorders that co-occur with BPD.
In addition to medication and therapy, people struggling with BPD can make some lifestyle adjustments. Getting enough sleep, engaging in an exercise routine, and psychoeducational can all help with BPD management.
Bipolar disorder is a mental health disorder that causes emotional lows and highs.
A research sample from from National Comorbidity Survey Replication showed that 2.8% of U.S. adults had been diagnosed with bipolar disorder.
When people are experiencing an emotional low they may become depressed and lose interest in normal activities. They may also feel hopeless, sad, or even become suicidal.
When those same individuals enter an emotional high state or a manic state, they feel euphoric and full of energy. They are often irritable, and their state of mind can affect their ability to think clearly and make smart judgments.
People who struggle with bipolar disorder, also known as BD, can experience mood swings as often as multiple times a day or as little as a few times a year. It is a lifelong condition and requires careful monitoring to overcome.
Although it can be managed, 82.9% of people with bipolar disorder experienced serious impairments
There are 3 types of bipolar. Bipolar I, Bipolar II, and Cyclothymic Disorder represent a spectrum of bipolar spectrum disorders defined in the DSM-5 by the severity, duration, and pattern of mood episodes.
Requires at least one manic episode lasting ≥7 days or requiring hospitalization, often with severe symptoms like grandiosity, racing thoughts, minimal sleep need, and risky behaviors; depressive episodes commonly follow but aren’t required for diagnosis.
Involves at least one hypomanic episode (milder mania, ≥4 days, less impairing) plus one major depressive episode; no full manic episodes occur, distinguishing it from Bipolar I.
Chronic, fluctuating hypomanic and depressive symptoms (not full episodes) for ≥2 years, with no symptom-free periods longer than 2 months; less severe but persistent.
If you suspect that you or someone you love is experiencing bipolar disorder, there are a few symptoms that you can look out for. In analyzing symptoms, you’ll need to remember that individuals have cycles that alternate between states of depression and mania.
Depressive episodes include feelings of hopelessness and sadness. Manic episodes include feelings of euphoria and irritability. Sometimes people can experience these cycles with both symptoms.
In between cycles, people with borderline personality often have symptom-free wellness. This can lead them to think that they have been cured of their illness.
In contrast, people struggling with BPD have persistent symptoms. Their illness is more likely to affect their daily life than BD is.
People who experience manic episodes may experience the following symptoms:
While these symptoms might not sound harmful, they’re not beneficial either. Many people in a manic state take rash actions. They don’t have the self-awareness they need to stay safe.
People in manic states can take actions that can put themselves and others at harm. Despite being the alternative to depression, they can be extremely dangerous.
When an individual with BD enters into a depressive state, they will experience different symptoms. These symptoms include:
These symptoms can last for long or short periods of time.
Learn more: How a Person with Bipolar Disorder Thinks
No one knows exactly what causes bipolar disorder. This disease is extremely complex, and many doctors believe that there is no single cause for it.
However, there are some factors that can put individuals at a higher risk for developing bipolar disorder. For example, genetic and family history can both affect a person’s likelihood to develop BD.
Chemical imbalances also play a role in bipolar disorder. When individuals have an imbalance in neurotransmitters in the brain, they may experience symptoms of bipolar disorder.
Diagnosing bipolar disorder is something that requires a few different assessments. This is different from BPD, which only requires an individual to meet certain criteria.
One evaluation for bipolar disorder includes getting a physical exam. This will most often include lab work or even MRIs to see if there is an underlying condition that is causing BD symptoms.
In addition to a physical exam, individuals may undergo a psychiatric exam. During this exam, the person will be asked about their behavior, feelings, and thoughts.
Another method for diagnosing bipolar disorder is something called mood charting. This requires you to keep track of your sleep patterns, moods, and environmental factors on a daily basis.
Finally, doctors may compare your symptoms with those of people who already suffer from bipolar disorder. They may compare your symptoms with a manual of diagnostics for mental disorders to come up with the correct diagnosis.
Getting treatment for bipolar disorder is extremely important. That’s because people who have bipolar disorder have a shorter life expectancy and higher rates of mortality.
Luckily, there are several ways that doctors can treat people suffering from BD. For one, they can prescribe medications. Medications such as antipsychotics, antidepressants, and mood stabilizers can all help people suffering from BD.
In addition to medication, people with borderline personality disorder can get psychotherapy treatment.
Sometimes a blend of these therapies will be needed to help a person fully heal. The exact type of therapy or therapies that a person needs will depend on their individual case.
For people who are suffering from more severe cases of BPD, they may be prescribed electroconvulsive therapy. This type of therapy uses brain stimulation to prevent mood swings.
Electroconvulsive therapy functions through transcranial magnetic stimulation. It is most often used for people who are suffering from severe depressive or manic episodes.
Knowing the difference between borderline personality disorder vs bipolar disorder is important for helping you or a loved one get the right treatment. With the right treatment, these mental illnesses can be controlled and cured.
If you are ready to take the next step in getting the mental health assistance you need, we’re here for you. Get in touch, and we’ll help you tackle the treatment that you need to overcome these disorders.
Below, we answer the questions we hear most often from clients and families trying to make sense of BP vs BPD diagnoses.
No. Despite the similar-sounding names and some overlapping symptoms, BPD and bipolar disorder are two distinct diagnoses that fall into different categories of mental health conditions.
Bipolar disorder is classified as a mood disorder, meaning it primarily affects a person’s emotional state through extended episodes of mania and depression. BPD is classified as a personality disorder, meaning it affects how a person experiences themselves, relates to others, and regulates emotions on an ongoing basis.
The confusion is understandable — both conditions involve mood instability, impulsivity, and difficulty in relationships. But the underlying mechanisms, treatment approaches, and long-term trajectories are different enough that getting the right diagnosis matters a great deal for recovery.
The core difference is in what shifts and how long the shifts last. Bipolar disorder is a mood disorder defined by distinct episodes of mania (or hypomania) and depression that last for days, weeks, or months. BPD is a personality disorder defined by rapid emotional reactivity—shifts that can happen within minutes or hours, almost always triggered by an interpersonal event such as a perceived rejection or abandonment.
Put simply: bipolar mood episodes happen to a person on their own internal timeline. BPD emotional shifts happen in response to the world around them.
Yes. Research suggests roughly 20% of people with bipolar disorder also meet criteria for BPD, and a similar overlap exists in the other direction. Co-occurring diagnoses are common and require an integrated treatment approach that addresses mood stabilization and emotional regulation at the same time. Our residential mental health program is built to treat co-occurring conditions through comprehensive assessment and individualized care.
In bipolar disorder, a manic episode typically lasts at least one week (or any duration if hospitalization is required), and a depressive episode lasts at least two weeks. Even in bipolar II or rapid-cycling forms, mood states are sustained over days.
In BPD, emotional shifts are measured in minutes to hours. A person can feel calm in the morning, devastated by lunchtime after a difficult text exchange, and back to baseline by dinner. This is called affective instability and is one of the hallmark features of BPD.
Bipolar episodes are largely driven by internal biological factors—neurochemistry, sleep disruption, seasonal changes, medication changes, or substance use. While stress can act as a trigger, the episode itself follows its own course once it begins.
BPD emotional shifts are almost always triggered by relational events: a friend not responding to a message, a partner seeming distant, a perceived criticism at work. The emotional response is intense and often disproportionate to the trigger.
Yes. Bipolar depression tends to be characterized by low energy, oversleeping, slowed thinking, and a pervasive flatness that can persist for weeks regardless of what is happening in the person’s life.
The depressed states in BPD are typically shorter, more reactive, and frequently accompanied by feelings of emptiness, loneliness, or fears of abandonment. A person with BPD may feel deeply depressed for a few hours and then feel better once a relationship feels secure again.
No, true mania does not occur in BPD. However, people with BPD can experience periods of intense energy, impulsivity, risky behavior, or euphoria that are sometimes mistaken for hypomania. The distinction is that in BPD, these states are short-lived and tied to emotional triggers, while bipolar hypomania is a sustained shift in mood and energy lasting at least four consecutive days.
Both diagnoses require evaluation by a qualified mental health professional. A thorough psychological evaluation and diagnosis typically includes a clinical interview, review of mood and behavior patterns over time, family history, and sometimes standardized assessments. Because symptoms overlap, accurate diagnosis often requires tracking patterns over multiple sessions rather than a single appointment.
Yes, significantly.
Bipolar disorder treatment is built around mood stabilization, typically combining medication (such as mood stabilizers or atypical antipsychotics) with psychotherapy focused on routine, sleep, and relapse prevention.
BPD treatment is primarily skills-based and emotion-focused. The gold-standard approach is dialectical behavior therapy (DBT), which teaches four core skill sets: mindfulness, distress tolerance, emotion regulation, and interpersonal effectiveness. Cognitive behavioral therapy is also commonly used to address the underlying thought patterns that drive emotional reactivity.
There is no medication approved specifically to treat BPD itself. However, medications may be used to address specific symptoms such as depression, anxiety, or mood instability, particularly when another condition is present alongside BPD. For bipolar disorder, medication is typically a central part of treatment. This is one of the most important practical differences between the two conditions.
Bipolar disorder has one of the strongest genetic links of any mental health condition, with heritability estimates around 60–80%. BPD also has a genetic component, but environmental factors—particularly early childhood experiences, trauma, and attachment disruptions—play a more prominent role in its development.
Bipolar disorder affects roughly 2.8% of U.S. adults in any given year, while BPD affects about 1.4%. However, BPD is significantly more common in clinical and inpatient settings, where prevalence rises to 10–20%.
Bipolar disorder affects roughly 2.8% of U.S. adults in any given year, while BPD affects about 1.4%. However, BPD is significantly more common in clinical and inpatient settings, where prevalence rises to 10–20%.
Neither condition is “cured” in the traditional sense, but the trajectories differ.
BPD has one of the better long-term outlooks of any personality disorder. Long-term studies show that the majority of people with BPD experience remission of symptoms within 10 years of beginning treatment, and many no longer meet diagnostic criteria.
Bipolar disorder is generally considered a lifelong condition that requires ongoing management. With consistent treatment, however, many people achieve long stretches of stability and live full, productive lives.
Neither condition is “worse” than the other — they’re different, and each presents its own challenges. Framing one as harder than the other tends to flatten the real experience of people living with these conditions and can reinforce stigma.
That said, there are honest differences worth understanding:
Bipolar disorder carries serious risks during manic and depressive episodes, including impulsive decisions with lasting consequences, hospitalization, and one of the highest suicide rates among psychiatric conditions. It typically requires lifelong medication management, but episodes are often predictable enough to plan around once a person and their treatment team understand the pattern.
BPD is often described as more painful day-to-day because the emotional intensity is nearly constant and tied to relationships, which can make work, friendships, and family life feel exhausting. BPD has historically carried heavier stigma — even within the mental health field — though that is changing as treatment outcomes improve.
The most meaningful difference may be the long-term outlook. BPD has one of the better recovery trajectories of any chronic mental health condition, with the majority of people experiencing significant symptom remission within a decade of starting treatment. Bipolar disorder is generally a lifelong condition requiring ongoing management, though many people achieve long stretches of stability and live full lives with consistent care.
The right question usually isn’t which is worse — it’s which one do I have, and what treatment actually works for it. That’s the question an evaluation can answer.