Bipolar Disorder Misdiagnosis: Common Causes and Differential Diagnoses
Author: Ukrainian Psychological Hub · Published: October 9, 2026 · Editorial Policy
Bipolar disorder misdiagnosis can occur in two directions. Someone who has bipolar disorder may be diagnosed with major depression or another condition because previous mania or hypomania was not recognized. Another person may receive a bipolar diagnosis when ADHD, borderline personality disorder, trauma-related symptoms, medication effects, substance use, a physical illness, or another condition better explains the clinical history. Both mistakes affect treatment decisions and how future symptoms are interpreted. National Institute of Mental Health; Zimmerman et al., 2008.
The most important diagnostic question is whether a person has experienced a distinct manic or hypomanic mood episode and whether its symptoms, duration, intensity, functional consequences, and context fulfill recognized diagnostic requirements. Irritability, distractibility, insomnia, mood changes, or impulsive behavior alone cannot answer this question. Clinical diagnosis requires a longitudinal account of symptoms, a careful differential diagnosis, and assessment of medical and substance-related explanations. NICE clinical guideline CG185, updated September 2025.
What bipolar disorder misdiagnosis means
Underdiagnosis means a bipolar condition is present but has not been identified. Overdiagnosis means a bipolar diagnosis is applied when adequate supporting evidence is absent or another condition accounts for the presentation. Delayed diagnosis refers to the interval between clinically significant symptoms and recognition. Diagnostic revision means an earlier formulation changes as information accumulates. These circumstances should be distinguished because an initial diagnosis of major depression may have been appropriate if no past mania or hypomania had occurred or could reasonably be identified at that point.
Bipolar I disorder is defined by at least one manic episode. Bipolar II disorder requires a lifetime hypomanic episode and a major depressive episode, without a lifetime manic episode. Cyclothymic disorder involves a persistent pattern of hypomanic and depressive symptoms that fall short of full episode thresholds. Other specified and unspecified bipolar and related disorders cover additional clinical presentations. International ICD-11 and American DSM-5-TR formulations are broadly related, with some differences in specific episode requirements. NIMH; WHO ICD-11 clinical diagnostic publication.
In the DSM framework, mania is a distinct period of unusually elevated, expansive, or irritable mood and increased energy or activity, with additional characteristic symptoms, ordinarily lasting at least a week or requiring hospitalization. It causes marked impairment, may necessitate hospitalization, or can involve psychosis. Hypomania is an observable change in mood and activity ordinarily lasting at least four consecutive days in DSM criteria, with a lesser degree of functional disruption and without psychosis. Psychotic symptoms or marked impairment during an apparent hypomanic episode require reassessment. Bipolar II is a distinct disorder and may carry substantial depressive burden. NIMH.
How frequently is bipolar disorder misdiagnosed?
A single universal misdiagnosis percentage cannot be derived responsibly from existing studies. Samples differ in whether patients are recruited from primary care, psychiatric clinics, emergency settings, or the community. Studies also differ in whether they compare clinicians' diagnoses with structured interviews, questionnaires, medical records, or future diagnostic information. Positive screening results must not be interpreted as the proportion of people who have bipolar disorder.
A systematic review by Cerimele and colleagues evaluated seven primary-care studies among people with depression or other psychiatric concerns. Rates identified by structured diagnostic interviews ranged from 3.4% to 9%, whereas positive bipolar screening rates ranged from 20.9% to 30.8%. These figures concern selected patient groups, not the population as a whole. The difference demonstrates the potential for false-positive screening and the importance of clinical interviews.
Evidence of overdiagnosis is also substantial in particular settings. In a study of 700 psychiatric outpatients, fewer than half of those who reported a previous professional bipolar diagnosis met the research interview criteria. This is a finding from one outpatient sample rather than a national prevalence estimate. Separately, a study of unrecognized bipolar illness among primary-care patients with depression found that estimates varied markedly with diagnostic definition and approach. Both directions of error deserve attention.
Why bipolar disorder is missed
Depression is often the reason for seeking help
People with bipolar disorders frequently seek treatment for low mood, loss of interest, poor concentration, fatigue, sleep disturbance, or hopelessness. A depressed state is observable during the consultation; earlier hypomania is often only discoverable through retrospective questioning. Hypomania may have seemed pleasant, productive, or ordinary compared with severe depression, and the person may not spontaneously report it. NIMH; CANMAT/ISBD evidence update.
A depressive episode can be correctly recognized while the longitudinal diagnosis remains incomplete. Some historical features, such as recurrent depression, younger age at onset, family history of bipolar disorder, psychotic features, or unusually activated episodes, justify closer investigation. These features are risk indicators rather than diagnostic confirmation. The defining distinction depends on establishing a clinical manic or hypomanic episode. CANMAT/ISBD.
Hypomania can go unnoticed
Hypomania may involve a sustained increase in energy, unusually intense activity, less need for sleep, heightened confidence, expansive plans, faster speech, greater sociability, or uncharacteristic spending. Some episodes are mainly irritable. A person who associates mania only with extreme euphoria may fail to recognize a clinically meaningful change. Partners or family members may identify changes in activity or judgment that the individual did not notice.
Equally, a busy weekend, ordinary enthusiasm, temperament, stress-related insomnia, or an isolated period of productivity cannot establish hypomania. The clinician must examine duration, symptom clustering, clear departure from baseline, observable changes, and alternative explanations. Reduced need for sleep means sleeping less without the expected fatigue, a pattern different from being exhausted but unable to sleep. NICE; VA/DoD 2023.
A snapshot is mistaken for a lifetime course
A psychiatric appointment often captures current depression, anxiety, agitation, or an emergency. One observation may be insufficient to reconstruct earlier episodes and periods between episodes. Historical records, clinical follow-up, and accounts from trusted observers can add important information. Decisions made during an acute emergency sometimes need later reassessment when immediate safety concerns have stabilized. NICE.
Co-occurring conditions obscure the pattern
ADHD, anxiety, substance use disorders, trauma-related conditions, and personality disorders may be present in addition to bipolar disorder. Symptoms can reflect more than one underlying process. Assuming that all distractibility belongs to ADHD may conceal a new manic episode; attributing every restless night to mania may create a false-positive bipolar diagnosis. A good assessment tests whether each proposed diagnosis independently meets its requirements. NIMH; Schiweck et al..
Histories can be incomplete or fragmented
Some individuals avoid mentioning impulsive behavior, substance use, sexual disinhibition, spending, or psychotic experiences. Others cannot remember the duration or sequence of events, especially following crises. Several clinicians may hold disconnected records. The solution is collaborative reconstruction rather than assigning certainty from a brief description. The NICE assessment protocol specifically covers family and treatment history, behavior between episodes, functioning, physical illness, and corroborating accounts where appropriate.
Why bipolar disorder is overdiagnosed
Many experiences are psychologically significant without necessarily constituting bipolar episodes. Emotional volatility, frustration, anger, risk taking, rapidly shifting thoughts, and poor sleep occur in different psychiatric and medical conditions and sometimes as responses to difficult circumstances. If their durations and associated changes are not examined, resemblance to a symptom list can be mistaken for a diagnosed syndrome.
Clinical labeling may also persist after a provisional emergency diagnosis or an incomplete assessment, especially when subsequent clinicians copy prior records. Prescription of a mood stabilizer or antipsychotic cannot by itself validate the diagnosis: several medications have other clinical indications. A favorable or unfavorable medication response is also insufficient as a stand-alone diagnostic test. VA/DoD guideline.
Screening adds another risk. In a specialty mood-clinic investigation, false-positive Mood Disorder Questionnaire responses were associated with PTSD, borderline personality disorder, and substance use disorder diagnoses. This means a positive questionnaire can reflect overlapping symptom dimensions. It does not mean those conditions are mutually exclusive with bipolar disorder.
Differential diagnosis: the most important clinical comparisons
Bipolar depression versus major depressive disorder
An episode of major depression may look very similar regardless of whether a person has bipolar disorder or unipolar major depressive disorder. No single depressive symptom reliably settles the distinction. Clinicians look for a lifetime history of manic or hypomanic episodes, along with the pattern of recurrence, past treatment, family history, and course. Earlier depression may be followed by recognition or emergence of an elevated mood episode. CANMAT/ISBD; NIMH.
Earlier onset, recurrent episodes, familial bipolar disorder, psychotic depressive symptoms, postpartum mood episodes, or treatment-emergent activation can prompt additional questions. They cannot replace episode-based diagnosis. The dedicated article Bipolar Depression vs Major Depression: Diagnosis and Treatment Differences examines treatment and diagnostic implications in greater detail.
Borderline personality disorder
Borderline personality disorder may include marked emotional reactivity, instability in relationships and self-image, impulsivity, and significant distress. Some outward behaviors resemble features seen during bipolar mania or depression. The clinician reconstructs whether the presentation consists of sustained mood and energy episodes or a longer-standing pattern of interpersonal and emotional-regulation difficulties. Both patterns can occur in the same person; an episodic presentation does not automatically exclude borderline features. Ruggero et al..
Research comparing the conditions has identified some potentially discriminating symptoms, but no single sign provides definitive separation. A 2021 study of screening items examined elevated mood, grandiosity, reduced need for sleep, and other dimensions while acknowledging methodological limitations. A person's history is more informative than labeling every brief emotional change a manic episode. See Bipolar Disorder vs Borderline Personality Disorder: How Clinicians Distinguish Them.
Attention-deficit/hyperactivity disorder
ADHD involves developmental patterns of inattention and/or hyperactivity-impulsivity that can persist across life settings. Distractibility, restlessness, talkativeness, impulsivity, and rapid thinking may overlap with manic or hypomanic symptoms. Timing matters: clinicians ask whether these patterns were present since developmentally earlier years and across ordinary periods of functioning or appeared as pronounced changes during distinct mood episodes.
ADHD and bipolar disorder can coexist. In a systematic review and meta-analysis of 71 studies, approximately 17% of adults with bipolar disorder also met study criteria for ADHD, though estimates varied substantially across methods and settings. Co-occurrence must be assessed rather than assumed from shared symptoms. The related guide Bipolar Disorder vs ADHD: Mood Episodes and Persistent Attention Symptoms develops this comparison.
Posttraumatic stress disorder and trauma-related symptoms
Trauma-related hyperarousal, sleep disturbance, reactivity, irritability, intense emotion, and problems concentrating may resemble aspects of bipolar presentations. A trauma history may also accompany actual bipolar disorder. Assessment looks at links to traumatic reminders, avoidance or re-experiencing, longer-term patterns, and whether independently recognizable periods of increased energy and changed mood occur.
In research on false-positive MDQ responses, PTSD was one condition associated with screening positivity among people without bipolar disorder. The observation supports thorough diagnostic interviews and care that recognizes trauma-related symptoms in their own right, regardless of whether bipolar disorder is also present.
Anxiety disorders
Anxiety and panic may involve agitation, racing thoughts, insomnia, and high physical arousal. These can overlap with selected manic symptoms while having distinct patterns of worry, fear, avoidance, and physiological distress. A clinician compares their timing, triggers, accompanying mood change, and functional course. Anxiety disorders can coexist with bipolar disorders, so demonstrating one does not settle the status of the other. NICE; NIMH.
Substance use and medication effects
Stimulants, certain antidepressants, corticosteroids, recreational drugs, intoxication, and withdrawal can contribute to agitation, sleeplessness, altered mood, or behavioral activation. The assessment examines exposure dates, changes in use, intensity and duration of symptoms, and whether an episode persists beyond the anticipated effects of a substance or medication.
Antidepressant-associated changes require precise interpretation. Feeling restless or sleeping poorly after starting a drug is not synonymous with mania. A convincing manic syndrome warrants prompt professional review, assessment of the medication timeline, and examination of previous episodes. A substance-induced condition can coexist with a separate bipolar disorder. NIMH; CANMAT/ISBD.
Schizophrenia and schizoaffective disorder
Severe depressive or manic episodes can involve hallucinations or delusions. The clinician determines when psychotic symptoms occurred relative to clinically significant mood episodes. Psychosis limited to mood episodes can support a mood disorder with psychotic features; sustained psychosis outside those episodes raises questions about schizophrenia spectrum conditions, including schizoaffective disorder. Distinguishing these presentations often requires more than one observation. NIMH psychosis information; NICE.
Psychosis is incompatible with classifying an episode as hypomania in DSM diagnostic rules. Severe changes in reality testing require urgent assessment regardless of the eventual diagnosis. The broader assessment of psychotic disorders belongs in specialist psychiatric care.
For the focused comparison of the timing of psychosis and mood episodes, see Bipolar Disorder vs Schizophrenia and Schizoaffective Disorder. The present article addresses how such confusion contributes to bipolar misdiagnosis.
Sleep and circadian rhythm conditions
Insomnia, shift work, sleep apnea, and circadian disruption can cause impaired concentration, irritability, fatigue, and changes in behavior. Sleep loss may also precipitate or aggravate mood episodes in susceptible individuals. Reduced need for sleep within a manic or hypomanic episode differs from feeling exhausted but unable to sleep. Neither finding alone determines the diagnosis. The clinician examines the associated mood and energy changes and the full course. NIMH.
Thyroid and other medical or neurological conditions
Thyroid dysfunction, neurological disease, some metabolic or endocrine disturbances, and effects of medical treatment may alter mood, energy, and behavior. New apparent mania later in life, neurological abnormalities, sudden onset after a medical event, and unusual clinical features can prompt targeted examination. Blood tests can identify some alternative causes and guide monitoring; no blood biomarker or brain scan independently establishes bipolar disorder. NICE; NIMH.
Cyclothymia, mixed features, and other bipolar-related presentations
A longstanding fluctuating pattern may fit cyclothymic disorder or another specified presentation rather than bipolar I or II, depending on the severity and duration of the episodes. Mixed features require assessment of specified symptoms occurring together during a qualifying episode; isolated agitation during depression is insufficient. Subthreshold mood symptoms can still warrant monitoring and clinical support while diagnostic uncertainty is documented. WHO ICD-11.
How clinicians distinguish a true mood episode
The first comparison is with the person's ordinary baseline. A highly energetic or talkative temperament differs from a new sustained period of pressured speech, multiple unfamiliar projects, markedly reduced sleep need, and altered judgment. Clinicians then ask whether symptoms occurred together, lasted sufficiently long, had recognizable beginnings and endings, caused observable consequences, and were better explained by substances or medical illness.
A detailed timeline connects mood, activity, sleep, cognition, judgment, functioning, psychosis, stressors, medications, and recovery periods. Family history, prior depressive recurrence, or response to treatment may increase clinical suspicion but cannot independently establish a manic or hypomanic episode. A diagnosis summarizes the entire course rather than a collection of isolated characteristics. VA/DoD; NICE.
The distinction between sustained bipolar episodes and short-lived emotional changes is developed in Bipolar Disorder vs Mood Swings: When Changes Become Clinical Episodes. The duration and associated energy changes must be assessed together.
What happens during diagnostic reassessment?
Lifetime episode and treatment timeline
A clinician maps depressive episodes, possible manic or hypomanic periods, symptoms between episodes, crisis presentations, prior medication changes, and major life disruptions. Useful descriptions include approximate dates, sleep and activity patterns, the extent of change from ordinary behavior, and observable consequences. Incomplete recollections are treated as uncertainties for further investigation.
Collateral history and previous clinical records
With appropriate consent, information from a partner, family member, or another observer may illuminate changes in sleep, activity, speech, risk taking, and judgment. Prior discharge summaries, clinical evaluations, prescriptions, and hospital records may help establish symptom chronology. These sources complement the person's account and are themselves evaluated critically. NICE assessment recommendation 1.3.2.
Screening, structured interviews, and observation
Validated instruments can prompt questions or organize information, while a structured diagnostic interview applies episode criteria more systematically. Repeated follow-up may be necessary when the chronology is unclear, symptoms are evolving, or episodes have not been directly observed. Physical health, substances, neurodevelopmental history, and psychiatric comorbidities are assessed together. VA/DoD guideline; WHO clinical diagnostic framework.
Diagnostic formulation and follow-up
The clinician explains which episodes support the working diagnosis, which alternatives remain plausible, what further evidence is needed, and how treatment addresses immediate and longer-term problems. A diagnosis may be revised when a new episode emerges or stronger evidence clarifies an earlier event. A revised label should lead to an understandable care plan rather than unexplained medication changes.
Why bipolar screening tests can mislead
The Mood Disorder Questionnaire, Hypomania Checklist-32, and Bipolar Spectrum Diagnostic Scale measure self-reported experiences associated with bipolar-spectrum symptoms. They are screening aids, not tests that determine the diagnosis. False positives may result from overlapping problems, and false negatives may occur when hypomania is hard to remember or recognize.
A meta-analysis of MDQ accuracy found that sensitivity varied by population, and a review by Zimmerman and Galione reported that the MDQ was less sensitive to bipolar II than bipolar I in the pooled studies examined. Accuracy estimates cannot be transferred indiscriminately from specialty psychiatry samples to the general public.
The NICE guideline advises against using questionnaires to identify bipolar disorder in adult primary care. The VA/DoD guideline recommends against routine screening of general medical populations but permits a validated instrument to aid decisions when suspicion arises in specialty mental health care. The setting and purpose explain these differences. Our Bipolar Disorder Screening Tests guide explains the limitations in detail.
Why an accurate diagnosis affects treatment
Treatments for acute mania, bipolar depression, and maintenance prevention have distinct evidence bases. If bipolar depression is mistaken for unipolar depression, an inappropriate antidepressant strategy may be used. If bipolar disorder is diagnosed without sufficient evidence, a patient may receive long-term treatment with adverse-effect and monitoring burdens despite a different underlying condition. Treatment decisions must reflect the person's actual clinical syndrome, phase, risks, preferences, and history. CANMAT/ISBD; VA/DoD.
Lithium requires monitoring of blood concentrations, kidney function, thyroid function, interactions, and toxicity. Lamotrigine has phase-specific indications and serious rash precautions. Valproate entails important reproductive risks and pregnancy restrictions. Antipsychotics have agent-specific metabolic, neurological, and other adverse effects. Antidepressant use in bipolar conditions requires careful monitoring for treatment-emergent activation or switching. All medication decisions belong in an individualized prescribing plan; the presence of a prescription is not proof of a particular diagnosis. NICE medication guidance; CANMAT/ISBD.
Questioning a diagnosis is a reason to request clinical review, not to abruptly discontinue lithium, anticonvulsants, antidepressants, or antipsychotics. Withdrawal, recurrence, and acute destabilization risks vary by drug and clinical context. Any change should be planned with the prescribing clinician, including appropriate monitoring and follow-up.
Particular populations require additional care
Children and teenagers
Developmental patterns, ADHD, trauma-related responses, normal changes in activity, and other conditions complicate interpretation of pediatric mood symptoms. Specialist clinicians assess whether sustained mood episodes represent clear deviations from developmental baseline. The NICE guideline recommends intensive prospective longitudinal monitoring and trained multidisciplinary assessment before diagnosing bipolar disorder in children and young people. Irritability alone does not determine the diagnosis.
Older adults
New agitation, apparent mania, cognitive change, or psychosis in later life calls for medical, neurological, cognitive, and medication assessment as well as psychiatric evaluation. An earlier bipolar diagnosis does not eliminate the possibility of an unrelated new illness. Clinicians consider changes in physical health and medication tolerability, with careful review of the complete prior history. NIMH; NICE.
Pregnancy and postpartum
Mood changes, disrupted sleep, past bipolar episodes, prior postpartum illness, and medication decisions require pregnancy-specific assessment. Severe postpartum mania or psychosis requires urgent specialist evaluation. Medication risks and risks of untreated illness must be considered together, especially with valproate and other medicines having reproductive safety concerns. Ordinary sleep disruption after childbirth does not establish mania. NICE.
Urgent warning signs and safety
Severe mania with profoundly impaired judgment, dangerous behavior, inability to meet basic needs, psychosis, or rapid escalation warrants urgent mental health assessment. So does severe depression accompanied by suicidal intent or immediate safety concerns. Protecting the person and others takes priority while the full diagnosis is being clarified. NICE crisis recommendations; NIMH.
In the United States, call or text 988 for crisis support. When there is an immediate threat to life or safety, contact emergency services. Outside the United States, use local emergency or crisis resources. Helping someone access care is more useful than attempting to settle a complex psychiatric diagnosis through an online questionnaire.
What to do if you think your diagnosis is wrong
Prepare a factual chronology of distinct periods of depression, unusual energy, changes in sleep, elevated or irritable mood, risky decisions, and ordinary functioning. Include the dates of medication changes and substance exposure when known. Describe observable behavior and its consequences rather than assuming the correct name of an episode. Bring prior records and, if comfortable, invite a trusted observer who can provide context.
Ask your clinician: Which documented episodes support this diagnosis? Did those episodes meet duration and severity requirements? Which alternative explanations have been examined? What evidence would lead to a revised diagnosis? How does the current treatment address the verified symptoms, and what monitoring is needed? A specialist second opinion is reasonable when uncertainty remains substantial, treatments have failed, or a diagnosis has changed repeatedly.
A helpful care plan documents the working diagnosis, possible comorbidities, remaining questions, crisis signs, treatment options, medication safety, and follow-up. Clinical assessment is a continuing process when symptoms and evidence evolve. For the full diagnostic process, read How Is Bipolar Disorder Diagnosed? Clinical Assessment Explained.
Common misconceptions
“Any mood swing means bipolar disorder”
Mood reactivity can arise in everyday life and many conditions. Bipolar episode diagnosis depends on sustained changes in mood and energy, additional characteristic symptoms, duration, functional impact, and clinical exclusion of other explanations. WHO ICD-11.
“A depression diagnosis rules out bipolar disorder forever”
An initial depressive syndrome may later be reclassified when mania or hypomania emerges or is reliably identified in the history. Depression alone still does not justify a bipolar label. NIMH.
“A positive online test confirms bipolar disorder”
Screening-positive is not diagnosis-positive. Test accuracy depends on clinical context, prevalence, and subtype; positive results require professional assessment. Cerimele et al..
“ADHD, trauma, or BPD makes bipolar disorder impossible”
These conditions can coexist with bipolar disorders. A clinician must evaluate each proposed condition against its criteria rather than assigning all symptoms to one diagnosis. NICE.
“A new diagnosis proves the old clinician was negligent”
Some diagnostic changes follow newly emerged mood episodes or better historical documentation. The quality of the earlier decision depends on the evidence reasonably available at that time, while the current priority is a well-supported formulation and safe treatment plan.
Frequently asked questions
What is the condition most commonly mistaken for bipolar disorder?
Major depressive disorder is a frequent confusion because depressive episodes can be identical in appearance during a single visit. The bipolar distinction relies on a history of qualifying mania or hypomania. ADHD, borderline personality disorder, PTSD, psychotic disorders, substances, and medical conditions are other important differentials. CANMAT/ISBD.
Is bipolar disorder often diagnosed as ADHD?
Shared symptoms include distractibility, restlessness, rapid speech, and impulsivity. Developmentally persistent patterns support ADHD, while distinct episodes of sustained mood and energy change raise bipolar questions. Both can coexist. Schiweck et al..
Can borderline personality disorder be mistaken for bipolar II?
Yes. Emotional instability and impulsivity can overlap with bipolar presentations. A careful episode history, persistent interpersonal patterns, and full diagnostic criteria guide the comparison. Both conditions may coexist. Ruggero et al..
How can clinicians tell mania from anxiety or insomnia?
They evaluate a cluster of elevated or irritable mood, increased energy and activity, altered sleep need, changes in behavior, duration, impairment, and alternative explanations. Insomnia or anxiety alone is insufficient. NIMH.
Can PTSD cause a false-positive bipolar screen?
Yes. Some research samples have found an association between trauma-related conditions and positive bipolar screens without a corresponding bipolar diagnosis on subsequent clinical evaluation. Screening is a starting point for further assessment. Paterniti et al..
Does antidepressant-induced insomnia prove bipolar disorder?
No. Side effects, agitation, and a clinical manic syndrome are different phenomena. A clinician must evaluate the full symptoms and treatment timeline. Seek prompt medical advice about concerning activation; do not change prescribed medication on your own. NIMH.
Is there a blood test or MRI that establishes bipolar disorder?
No validated routine blood or imaging test independently diagnoses bipolar disorder. Tests help investigate other medical explanations and support medication monitoring. NIMH.
Can a psychiatrist remove or change a bipolar diagnosis?
Yes. A specialist can revise the diagnosis when new episodes, better historical evidence, or another explanation justify a change. The clinician should document the reasons and develop a safe plan for any necessary treatment adjustment. VA/DoD.
Should I stop medication after a possible misdiagnosis?
Arrange a prescribing review. Stopping or altering treatment abruptly may create clinical risks, and the safest approach depends on the drug, the actual condition, and the person's recent course. NICE.
Related Articles
References
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