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Open research questions in Bipolar Disorder and Treatment

581 gap statements mined from Bipolar Disorder and Treatment papers in our 7.9M-paper local library, which holds 3,055 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • Future prospective, longitudinal, and mechanistic studies are warranted to clarify the causal nature of these associations, explore dose-dependent effects, and determine whether modulation of systemic inflammation may represent a clinically meaningful therapeutic pathway in the management of BD.

    Mood stabilizers and systemic inflammatory burden in euthymic patients with bipolar disorder: a comparative study of lithium and valproate · 2026 · DOI

  • Further studies of BD require the development of a unified integrative mechanism-based model that could account for the genetic, molecular, brain circuit, and behavior levels of this disorder.

    Reconceptualizing bipolar disorder through an integrative biological lens: synthesis, convergence, and emerging directions · 2026 · DOI

  • Despite extensive research into pharmacological, genetic, and neuroimaging aspects, the pathophysiology of bipolar disorder (BD) remains not fully understood.

    426. Possible immunological pathophysiology in bipolar disorder: transcriptome analysis using induced microglia-like (iMG) cells and iPSC derived neurons · 2026 · DOI

  • Early adversity is strongly linked to mood dysregulation, social impairment, and psychotic symptoms, yet the psychosocial mechanisms that shape loneliness across BD subtypes remain poorly understood.

    209. Early adversity, social support, and loneliness in bipolar disorder: the distinct role of psychotic features · 2026 · DOI

  • However, the mechanisms linking loneliness, social support, and social cognition, particularly theory of mind (ToM), remain insufficiently understood across BD subgroups and healthy controls (HC).

    191. Loneliness, social cognition, and psychotic features in bipolar disorder: the mediating role of social support · 2026 · DOI

  • The pathophysiology of BD is complex, and it remains unclear which mitochondrial mechanisms are altered first or whether multiple mechanisms are affected simultaneously during disease progression.

    The Association Among Bipolar Disorder, Mitochondrial Dysfunction, and Reactive Oxygen Species · 2025 · DOI

  • The validity of the current diagnosis of BD has been a relatively neglected topic and warrants further research. Mania and melancholia appear to be valid constructs in nosological terms, although their diagnostic validity could be improved. The nosological and diagnostic validity of hypomania and non-melancholic/non-psychotic depressive episodes is limited.

    A Critical Overview of the Validity of the Current Concept of Bipolar Disorder · 2025 · DOI

  • However, its association with executive dysfunction in adolescents with bipolar disorder and those with disruptive mood dysregulation disorder (DMDD) remains unclear.

    APPETITE HORMONE DYSREGULATION AND EXECUTIVE DYSFUNCTION AMONG ADOLESCENTS WITH BIPOLAR DISORDER AND DISRUPTIVE MOOD DYSREGULATION DISORDER · 2025 · DOI

  • Cognitive aging is a known phenomenon in individuals with bipolar disorder (BD), but the underlying biological mechanisms responsible for this cognitive decline remain poorly understood.

    THE ASSOCIATION OF KLOTHO/FIBROBLAST GROWTH FACTOR 23 WITH COGNITIVE FEATURES IN ELDERLY PATIENTS WITH BIPOLAR DISORDER · 2025 · DOI

  • There’s also been extensive research on the relationship between platelet and oncogenesis; however, mechanisms associated with oncogenesis in BD patients, and its interplay with platelets, warrant further investigation, particularly the programmed cell death (PD) pathway, which is related to affective disorders and pivotal in regulating the balance between chronic inflammation and carcinogenesis.

    329. DIFFERENTIALLY EXPRESSED PLATELET ONCOPROTEINS AND THEIR ASSOCIATION WITH PLASMA PROGRAMMED CELL DEATH LIGAND 1 IN BIPOLAR MANIC PATIENTS · 2025 · DOI

  • While previous research has focused on the genetic and environmental contributors to BD, the role of physical activity as a modifiable lifestyle factor remains underexplored.

    The Impact of Physical Activities on Men’s Mental Health: A Focus on Bipolar Disorder Prevention · 2025 · DOI

  • Future research should explore the neurobiological mechanisms underlying this association and further investigate the effectiveness of different types of physical activities in BD prevention and treatment strategies.

    The Impact of Physical Activities on Men’s Mental Health: A Focus on Bipolar Disorder Prevention · 2025 · DOI

  • Although the current evidence base is limited by the small number of well-powered randomized controlled trials and substantial heterogeneity across studies, the available data suggest that psychosocial interventions may be beneficial in reducing both depressive and manic symptoms.

    Adjunctive psychosocial interventions for children and adolescents with bipolar spectrum disorders: a systematic review and meta-analysis · 2026 · DOI

  • The coexistence of bipolar disorder and functional neurological symptoms remains underrecognized, despite shared mechanisms involving limbic–motor network dysregulation and stress-related neurobiological pathways.

    838. Functional Neurological Symptoms in Bipolar Disorder: A Case Illustrating Affective Dysregulation and the Neuropsychiatric Interface Between Mood Instability and Conversion Symptom · 2026 · DOI

  • However, no consensus exists on individualized and time‐varying intervenable conversion predictors for both BD and SCZ.

    Predicting Conversion From Unipolar Depression to Bipolar Disorder and Schizophrenia: A 10‐Year Retrospective Cohort Study on 12,182 Inpatients · 2025 · DOI

  • Despite the recognized influence of CT on clinical trajectories, limited evidence exists on how it affects specific pharmacological responses in BD.

    Lurasidone response in bipolar type I depression with childhood trauma exposure · 2025 · DOI

  • Commercially-available lithium has not been subjected to rigorous research and should be examined in long-term trials for people with subclinical cognitive or mood symptoms, and/or those at risk of neurodegenerative or affective illnesses.

    606. LITHIUM: HOW LOW COULD WE GO? · 2025 · DOI

  • However, the relative contributions of specific cognitive domains to global functioning remain unclear.

    309. Cognitive correlates of functional recovery in remitted bipolar disorder · 2026 · DOI

  • However, robust, replicable brain-based markers of risk in this population are lacking.

    Brainwide Structural Markers of Familial and Clinical Risk for Bipolar Disorder in Youth · 2026 · DOI

  • Functional near-infrared spectroscopy (fNIRS) during a verbal fluency task (VFT) probes prefrontal function, but three-group comparisons under leakage-free machine learning are scarce.

    Reduced prefrontal activation and region-specific laterality reversal in bipolar depression during verbal fluency: a 52-channel fNIRS study with leakage-free machine-learning discrimination · 2026 · DOI

  • While the exact underlying neurobiology is not yet fully understood, imbalances in neurotransmitter systems, particularly dopamine, appear to play a central role.

    Developing a Rat Model for Bipolar Disorder · 2025 · DOI

  • The role of interleukin-7 in this putative abnormality should be further investigated.

    Higher T central and lower effector memory cells in bipolar disorder: A differentiation abnormality? · 2024 · DOI

  • NICE recommends that clinicians ‘ensure that older people with bipolar disorder are offered the same range of treatments and services as younger people with bipolar disorder.’4 It is therefore striking that in a growing population with increasing clinical complexity, multimorbidity, susceptibility to adverse side-effects and greater monitoring requirements, the evidence base guiding lithium treatment in older adults…

    Mind the gap: lithium prescribing for older adults · 2026 · DOI

  • 4% lifetime risk of BD, far exceeding the prevalence in the general population, which strongly indicates overlapping molecular pathological cascades underlying the two disorders, and transcriptomic evidence has further confirmed convergent alterations in mitochondrial metabolism, oligodendrocyte homeostasis and systemic inflammatory signaling between BD and MS, yet systematic mining of shared diagnostic epigenetic…

    Identification of BRD4 as a Shared Diagnostic Biomarker Between Bipolar Disorder and Multiple Sclerosis Using Machine Learning · 2026 · DOI

  • Impact of insulin and insulin resistance on brain dopamine signalling and reward processing—An underexplored mechanism in the pathophysiology of depression? Neurosci.

    Insulin Resistance in Bipolar Disorder: A Real-World Cross-Sectional Study · 2026 · DOI

Most-cited papers in Bipolar Disorder and Treatment

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Open questions raised by papers listed on this page include: (1) Despite extensive research into pharmacological, genetic, and neuroimaging aspects, the pathophysiology of bipolar disorder (BD) remains not fully understood (“426. Possible immunological pathophysiology in bipolar disorder: transcriptome…”, 2026); (2) Early adversity is strongly linked to mood dysregulation, social impairment, and psychotic symptoms, yet the psychosocial mechanisms that shape loneliness across BD subtypes remain poorly understood (“209. Early adversity, social support, and loneliness in bipolar disorder: the…”, 2026); (3) The mechanisms linking loneliness, social support, and social cognition, particularly theory of mind (ToM), remain insufficiently understood across BD subgroups and healthy controls (HC) (“191. Loneliness, social cognition, and psychotic features in bipolar disorder:…”, 2026); (4) The relative contributions of specific cognitive domains to global functioning remain unclear (“309. Cognitive correlates of functional recovery in remitted bipolar disorder”, 2026); (5) Robust, replicable brain-based markers of risk in this population are lacking (“Brainwide Structural Markers of Familial and Clinical Risk for Bipolar Disorder…”, 2026). 581 gap statements have been mined from Bipolar Disorder and Treatment papers in our 7.9M-paper local library, which holds 3,055 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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