What is the Difference Between Bipolar Disorder and Borderline Personality Disorder?

There are many stigmas and stereotypes that often impact the conversations in harmful ways when discussing mental health. One specific stigma that causes harm is when people believe that certain mental health disorders are the same because they have similar symptoms, such as bipolar disorder and borderline personality disorder (BPD). These misconceptions can keep individuals from getting the proper help they need through misdiagnoses or because they aren’t sure what they are struggling with in the first place. By understanding the differences between BPD and bipolar disorder, individuals can begin getting the help they need more quickly to facilitate healing.

Defining the Two

The similarity of symptoms between bipolar disorder and BPD is often the root of confusion concerning the two. By laying out the symptoms to better understand the differences, this confusion can be addressed and help individuals understand what they are experiencing more clearly.

Bipolar Disorder

First off, it is essential to define what bipolar disorder is. The National Institutes of Mental Health (NIH) defines bipolar disorder as “a mental disorder that causes unusual shifts in mood, energy, activity levels, concentration, and the ability to carry out day-to-day tasks.” There are three types of bipolar disorder that are characterized by mood changes, activity levels, and energy. Mood changes are intense, ranging from feelings of euphoria and mania to severely low moods of depression and hopelessness. Impulsive behavior is also extremely common. The disorder is usually diagnosed during the late teen years or early adulthood. Lifelong treatment is often required to help manage symptoms and improve the overall quality of life.

  1. Bipolar I Disorder: This type of bipolar disorder is characterized by manic episodes of seven days or more. The manic episodes experienced with this type of bipolar can be severe enough that the person needs to be hospitalized. Someone who has bipolar I may or may not experience depressive episodes in between mania. Mixed episodes of mania and depression can also occur.
  1. Bipolar II Disorder: Bipolar II is less intense than bipolar I in that there are not full-blown manic episodes. The mania experienced in this type of bipolar is known as hypomania, with symptoms being less intense. However, diagnosis for bipolar II requires an individual to experience depressive episodes that last two or more weeks. 
  1. Cyclothymic Disorder (i.e., Cyclothymia): This type of bipolar disorder is characterized by hypomanic symptoms and depressive symptoms for a minimum of two years. However, the symptoms experienced do not meet the diagnostic criteria for a hypomanic episode or depressive episode.

Borderline Personality Disorder

Borderline personality disorder, also known as BPD, is similar to bipolar disorder in that it often induces mood swings and impulsive behavior. However, it differs in symptoms in that BPD is characterized by consistent patterns of unstable relationships. A more definitive definition by the NIH states that BPD “is an illness marked by an ongoing pattern of varying moods, self-image, and behavior.” Individuals with BPD often struggle with self-image and emotions, causing them to lash out and engage in self-harm tendencies. It is not uncommon for their values and interests to change rapidly or for the person to view things in extremes. The majority of individuals struggle with all-or-nothing thinking, causing distorted images of themselves, those around them, and external situations. 

The Key Difference

The best way to understand the differences between bipolar disorder and BPD is to know the difference between a mood disorder and a personality disorder. These are characterized by specific symptoms and ways of thinking, providing a more apparent distinction between the two disorders.

Mood disorders affect a person’s daily emotional state and are characterized by severe changes in mood. On the other hand, personality disorders are characterized by constant patterns of thoughts and behaviors that are “unhealthy and inflexible.” The way a person acts or feels is often different than what would typically be expected by general society. 

Treatment Options

Treating these two disorders looks different as well. Various approaches are taken that address the specific symptoms and needs of the person struggling. For example, treating bipolar disorder will typically involve medications such as antipsychotics or mood stabilizers. Psychotherapy is usually combined with this treatment to give the person the best chance of managing their symptoms and improving their overall quality of life. 

Treating BPD, on the other hand, is most effective through psychotherapy. However, the use of some medications can be helpful. Dialectical behavior therapy (DBT) is common in treating patients with BPD; it helps them learn what behaviors negatively impact their lives and how to make better choices. Overall, the two disorders can be treated appropriately and offer hope for those that are currently struggling.


When discussing bipolar disorder and borderline personality disorder (BPD), many people often confuse the two for being the same disorder. However, they each have their own symptoms that can cause disruptions in a person’s daily life and overall ability to function. By understanding the differences between BPD and bipolar disorder, our hope at NorthStar Transitions is that individuals will have a better idea of what they are struggling with and get the help they need. At NorthStar, we understand the risks that having these disorders puts you in, and we strive to help our clients heal internally and externally. Our wide range of treatment programs for both addiction and mental health will address your specific recovery needs and facilitate healing on a new level. Located in the beautiful mountains of Colorado, we are waiting to help you reclaim your life. Call NorthStar Transitions today at (303) 558-6400 to get started.


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