Shawn Faust, DNP, PMHNP-BC
Published on 6/22/2026
What Is Bipolar II?
The word “Bipolar” refers to the two poles of mood: Manic and Depressive.
Bipolar II is a type of mood disorder defined by at least one Hypomanic episode and at least one depressive episode, with no history of full Mania.¹˒² Depressive episodes are characterized by low mood, loss of energy, difficulty functioning, and in some cases, thoughts of suicide. Bipolar II is often dominated by prolonged, debilitating depressive episodes that can be just as severe as those in Bipolar I.²˒³
(Hypo)manic episodes are the opposite — periods of abnormally elevated or irritable mood, increased energy, decreased need for sleep, and impulsive behavior.² However, this does not make Bipolar II a “milder” illness — it is a distinct, often more depression-dominant course.¹˒³
Bipolar II affects approximately 1–2% of the population and is more commonly diagnosed in women, partly because women tend to experience more depressive episodes and are more likely to seek help during depression.²˒³ The average age of onset is the mid-20s.² The average delay from symptom onset to correct diagnosis is approximately 7–10 years.³˒⁴
What Bipolar II Feels Like
For many people with Bipolar II, depression is the dominant experience. The depressive episodes feel identical to MDD — a heavy, pervasive sadness, loss of interest in everything, crushing fatigue, difficulty thinking, and sometimes thoughts of suicide. These episodes can last weeks to months and are often the reason people first seek help.
Hypomania, by contrast, may not feel like a problem at all — it often feels like relief. There is a noticeable increase in energy, confidence, and productivity. Sleep needs decrease, ideas flow freely, and social engagement increases. It can feel like finally being “the real me” — the version that is sharp, charismatic, and capable. But hypomania has a cost. Judgment can be subtly impaired — spending may increase, commitments may be overextended, and interpersonal boundaries may be crossed. The elevated mood may tip into irritability. And critically, hypomania is often followed by a depressive crash, making the contrast even more painful.
The cycling between these states — sometimes with periods of normal mood in between — creates a sense of instability and unpredictability that can be deeply unsettling. Many people describe not trusting their own moods: “Am I genuinely happy, or is this hypomania?”
Signs and Symptoms of Bipolar II
Bipolar II involves distinct episodes of Hypomania and depressive episodes.
DSM-5 Diagnostic Criteria
Hypomanic Episode (lasting at least 4 consecutive days):²
- Abnormally elevated, expansive, or irritable mood
- Markedly increased energy or activity
- Decreased need for sleep (e.g., feeling rested after only 2–3 hours)
- Rapid, pressured speech — talking more than usual or feeling pressure to keep talking
- Racing thoughts or flight of ideas
- Distractibility
- Increased goal-directed activity (at work, socially, or sexually) or psychomotor agitation
- Excessive involvement in risky activities (spending sprees, reckless driving, impulsive sexual behavior, foolish business investments)
Key distinction from Mania: The difference between Hypomania and full Mania is based on duration — Hypomania lasts at least 4 consecutive days, while full Mania lasts 7 or more days (or any duration if hospitalization or psychosis occurs).²
Depressive Episode (lasting at least 2 weeks):²
- Persistent sadness, emptiness, or hopelessness
- Loss of interest or pleasure in activities
- Fatigue or loss of energy
- Sleep disturbance (insomnia or hypersomnia)
- Changes in appetite or weight
- Difficulty concentrating or making decisions
- Feelings of worthlessness or excessive guilt
- Psychomotor retardation (slowed movements/speech) or agitation
- Thoughts of death or suicide
Mixed Features Specifier: Some episodes involve simultaneous manic and depressive symptoms — for example, racing thoughts and high energy combined with despair and suicidal thinking. These mixed episodes can be particularly dangerous.²
Additional & Associated Features
Beyond the formal diagnostic criteria, Bipolar II may also involve:²˒³
- Poor insight during hypomania — the episode may feel productive and positive rather than pathological
- Impaired judgment leading to financial, interpersonal, or occupational consequences
- Rapid cycling (four or more mood episodes per year)
- Increased risk of substance use as a coping mechanism
How Bipolar II Affects Daily Life
Bipolar II can have a profound impact on every area of life. Depressive episodes are often the longest mood phase and the most disabling aspect of the illness — work productivity drops, relationships suffer from withdrawal and irritability, and self-care deteriorates. People with Bipolar II tend to spend a greater proportion of their time in depression than those with Bipolar I.¹˒³
Hypomania, while less overtly destructive than full Mania, can still cause problems. Impulsive financial decisions, overcommitment, interpersonal friction, and irritability can strain relationships and create practical difficulties. The instability of mood — even when episodes are relatively brief — makes it difficult to maintain consistent routines and long-term plans.
Between episodes, many people function well, but the unpredictability of the illness creates ongoing anxiety about when the next episode will occur. Maintaining stable employment, relationships, and daily routines requires ongoing treatment and self-management.
The risk of suicide in Bipolar II is significant and comparable to Bipolar I.⁵˒⁶ The combination of prolonged depressive episodes and impulsivity during mood instability contributes to this risk.
Find Clarity. Move Forward.
Common Causes and Risk Factors for Bipolar II
Bipolar II does not have a single cause. It arises from a combination of biological, psychological, and environmental factors.
Genetics: Bipolar II is highly heritable. Family studies show that first-degree relatives of people with Bipolar II have elevated rates of both Bipolar II and MDD. The genetic overlap between Bipolar I and Bipolar II is substantial but not complete — they appear to be related but distinct conditions.³
Brain biology: Similar to Bipolar I, Bipolar II involves differences in brain circuits related to emotional regulation and reward processing. Neurotransmitter systems including serotonin, dopamine, and norepinephrine are implicated.³
Temperament: People with high emotional reactivity or traits associated with novelty-seeking and impulsivity may be at increased risk.²
Life experiences: Stressful life events, sleep disruption, and substance use can trigger episodes. Childhood adversity is associated with earlier onset and a more severe course.²
Clinical red flags for Bipolar II (vs. MDD): Early age of onset, family history of Bipolar, multiple depressive episodes, atypical depressive features (hypersomnia, increased appetite, leaden paralysis), and antidepressant-induced (hypo)mania or mood instability all suggest Bipolar rather than MDD.¹˒³
Other factors: Bipolar II is more commonly diagnosed in women, partly because women tend to experience more depressive episodes, more rapid cycling, and more mixed features.²˒³
How Bipolar II Is Diagnosed
Bipolar II is diagnosed through a clinical interview with a mental health professional — not through lab work or imaging. Brief screening questionnaires such as the Mood Disorder Questionnaire (MDQ) may be used to help identify symptoms and track progress over time.¹ The clinician will ask about current and past mood episodes, with particular attention to any history of periods with unusually high energy, decreased need for sleep, increased productivity, or uncharacteristic behavior lasting several days. Collateral information from family members or close friends can be invaluable, as Hypomania is often not recognized by the patient.¹
To meet diagnostic criteria, there must be at least one lifetime Hypomanic episode and at least one depressive episode, with no history of a full Manic episode.² The challenge is that Hypomania often feels good and does not cause the dramatic impairment of Mania, so it frequently goes unreported.
The clinician will also consider whether symptoms are better explained by another mental health condition. MDD shares identical depressive episodes, but lacks the history of Hypomanic episodes. Bipolar I involves full Manic episodes (lasting 7 or more days, causing severe impairment, or requiring hospitalization) rather than Hypomania.¹˒²
The evaluation is straightforward and conversational — the goal is to understand your experience so the right treatment can begin.
Treatment for Bipolar II
Bipolar II responds well to treatment. The two main evidence-based approaches are medication and psychotherapy. Unlike anxiety disorders and depression, medication is the mainstay of treatment for Bipolar II — therapy alone will not treat this condition.¹ Most people improve significantly with evidence-based treatment, and many achieve long-term stability.
Lifestyle strategies: Maintaining regular sleep schedules is critical — sleep disruption is one of the most potent triggers for (Hypo)manic episodes.²˒³ Avoiding alcohol and recreational drugs, managing stress, and monitoring mood are essential components of long-term stability.
Medication: Bipolar II requires lifelong medication.¹˒³ Treatment typically involves one or more of the following medication classes:
Lithium and valproate: Lithium is the gold-standard mood stabilizer — effective for treating and preventing (Hypo)manic episodes, with additional benefit for depressive episodes.¹˒³ It is the only Bipolar medication with consistent evidence for reducing suicide risk.⁸˒⁹ Lithium requires regular blood level monitoring along with kidney and thyroid function tests. Valproate/divalproex (Depakote) is another established mood stabilizer, particularly effective for acute (Hypo)mania and mixed episodes.¹
Lamotrigine: Lamotrigine (Lamictal) has strong evidence for preventing depressive episodes and is often a cornerstone of long-term maintenance.¹ It is not effective for treating or preventing acute (Hypo)mania. Lamotrigine requires slow dose titration to reduce the risk of serious skin reactions.
Atypical antipsychotics: This class spans both poles of the illness. For (hypo)manic episodes, aripiprazole (Abilify) and cariprazine (Vraylar) are often preferred for their lower metabolic and sedation burden; risperidone (Risperdal), olanzapine (Zyprexa), and quetiapine (Seroquel) are also effective.¹ For depressive episodes, quetiapine, lurasidone (Latuda), cariprazine, lumateperone (Caplyta), and the olanzapine/fluoxetine combination (Symbyax) have evidence of efficacy.³
Antidepressants: Antidepressants are used cautiously in Bipolar II, since they can trigger (Hypo)mania or rapid cycling. When prescribed, they are always paired with a mood stabilizer or antipsychotic, never used alone.¹˒³
Psychotherapy: CBT and psychoeducation have the strongest evidence as adjuncts to medication — reducing relapse rates, depressive symptoms, and improving functioning.¹ DBT may be particularly helpful for patients with emotional dysregulation or suicidal ideation.
Why lifelong treatment matters: Bipolar II is a progressive condition. Without sustained treatment, episodes tend to become more frequent, more severe, and harder to treat over time.⁷ Research suggests that treatment response is greatest in the early stages of the illness, making early and sustained treatment critical.¹⁰ Approximately 5–15% of people with Bipolar II will eventually experience a full Manic episode, changing the diagnosis to Bipolar I.¹¹˒¹² Feeling well is often a sign that treatment is working — stopping medication is one of the most common causes of relapse.
When to Seek Professional Help for Bipolar II
Consider seeking help if:
- Antidepressant treatment has caused mood instability, agitation, or “switching” to an elevated mood
- There have been periods of unusually elevated mood, energy, or irritability lasting several days or more
- Impulsive or risky behavior is occurring that is out of character
- Depression is severe or persistent
- Sleep patterns have changed dramatically (particularly a decreased need for sleep without fatigue)
- There is reliance on alcohol or other substances to manage mood
- Bipolar II can progress to Bipolar I at any time — if symptoms are escalating, early evaluation is important
Go to the emergency room or call 911 if experiencing psychotic symptoms (delusions, hallucinations) or dangerous behavior.
Seek immediate help if experiencing thoughts of self-harm or suicide. Contact the 988 Suicide and Crisis Lifeline by calling or texting 988, available 24/7.
Conditions That Can Look Similar to Bipolar II
Consider seeking help if:
- Antidepressant treatment has caused mood instability, agitation, or “switching” to an elevated mood
- There have been periods of unusually elevated mood, energy, or irritability lasting several days or more
- Impulsive or risky behavior is occurring that is out of character
- Depression is severe or persistent
- Sleep patterns have changed dramatically (particularly a decreased need for sleep without fatigue)
- There is reliance on alcohol or other substances to manage mood
- Bipolar II can progress to Bipolar I at any time — if symptoms are escalating, early evaluation is important
Go to the emergency room or call 911 if experiencing psychotic symptoms (delusions, hallucinations) or dangerous behavior.
Seek immediate help if experiencing thoughts of self-harm or suicide. Contact the 988 Suicide and Crisis Lifeline by calling or texting 988, available 24/7.
Frequently Asked Questions About Bipolar II
Is Bipolar II a milder form of Bipolar I?
No. Bipolar II often involves more frequent and prolonged depressive episodes, resulting in comparable or even greater overall disability.³ The suicide attempt rate is comparable to Bipolar I.⁵˒⁶ Hypomania is shorter than full Mania, but the overall burden of illness is driven by depression.
Can Bipolar II become Bipolar I?
Yes. Approximately 5–15% of people with Bipolar II will eventually experience a full Manic episode, changing the diagnosis to Bipolar I.¹¹˒¹² Younger age of onset and untreated illness are risk factors for this progression.
Why was I told I have depression if I actually have Bipolar II?
This is very common. People with Bipolar II typically seek help during depressive episodes and may not recognize Hypomania as abnormal. The average delay from symptom onset to correct diagnosis is approximately 7–10 years.³˒⁴
Is it safe to take antidepressants with Bipolar II?
Antidepressants can be helpful but carry a risk of triggering Hypomania or rapid cycling. They should generally be combined with a mood stabilizer and never used as monotherapy.¹˒³
References
- Nierenberg AA, Agustini B, Köhler-Forsberg O, et al. Diagnosis and Treatment of Bipolar Disorder: A Review. JAMA. 2023;330(14):1370-1380.
- American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR). American Psychiatric Publishing; 2022.
- McIntyre RS, Berk M, Brietzke E, et al. Bipolar Disorders. Lancet. 2020;396(10265):1841-1856.
- Keramatian K, Pinto JV, Schaffer A, et al. Clinical and Demographic Factors Associated With Delayed Diagnosis of Bipolar Disorder: Data From the HOPE-BD Study. J Affect Disord. 2022;296:305-312.
- Dev DA, Le GH, Kwan ATH, et al. Comparing Suicide Completion Rates in Bipolar I Versus Bipolar II Disorder: A Systematic Review and Meta-Analysis. J Affect Disord. 2024;360:1-8.
- Tondo L, Pompili M, Forte A, Baldessarini RJ. Suicide Attempts in Bipolar Disorders: Comprehensive Review of 101 Reports. Acta Psychiatr Scand. 2016;133(3):174-186.
- Carvalho AF, Firth J, Vieta E. Bipolar Disorder. N Engl J Med. 2020;383(1):58-66.
- Cipriani A, Hawton K, Stockton S, Geddes JR. Lithium in the Prevention of Suicide in Mood Disorders: Updated Systematic Review and Meta-Analysis. BMJ. 2013;346:f3646.
- Fitzgerald C, Christensen RHB, Simons J, et al. Effectiveness of Medical Treatment for Bipolar Disorder Regarding Suicide, Self-Harm and Psychiatric Hospital Admission: Between- and Within-Individual Study on Danish National Data. Br J Psychiatry. 2022;221(4):637-643.
- Berk M, Brnabic A, Dodd S, et al. Does Stage of Illness Impact Treatment Response in Bipolar Disorder? Empirical Treatment Data and Their Implication for the Staging Model and Early Intervention. Bipolar Disord. 2011;13(1):87-98.
- Hsu CW, Chen YB, Wang LJ, et al. Uncovering Predictors of Bipolar II Conversion to Bipolar I: A Machine Learning Analysis of National Health Records in Taiwan. J Affect Disord. 2025;370:113-121.
- Alloy LB, Urošević S, Abramson LY, et al. Progression Along the Bipolar Spectrum: A Longitudinal Study of Predictors of Conversion From Bipolar Spectrum Conditions to Bipolar I and II Disorders. J Abnorm Psychol. 2012;121(1):16-27.
6/22/2026