At least one lifetime manic episode; depressive and hypomanic episodes common but not required for diagnosis.
Also known as: bipolar disorder, bipolar I, mania, manic-depressive illness
Overview
A chronic mood disorder defined by at least one lifetime manic episode — a distinct period of abnormally elevated, expansive, or irritable mood and increased goal-directed activity lasting >=7 days (or any duration if hospitalization is required) with associated DIG FAST symptoms. Most patients also experience major depressive episodes and hypomania, but neither is required for diagnosis.
Epidemiology
Lifetime prevalence ~1% (bipolar I); ~2.4% for bipolar spectrum. Equal sex distribution. Mean onset late teens to early 20s. High familial loading — heritability ~70-85%.
Try two board-style Bipolar I Disorder questions
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Question 1PsychiatryMedium
A 22-year-old man is brought in by his family for 3 weeks of markedly decreased need for sleep, expansive grandiosity, and rapid, pressured speech. During this period he impulsively spent $50,000 on cryptocurrency and launched several business ventures. He has had no prior psychiatric episodes and uses no substances. On mental status examination he is euphoric and hyperverbal with flight of ideas. Which of the following is the most appropriate initial pharmacotherapy?
ALithium
BSertraline
CHaloperidol
DLorazepam
Reveal answer & full explanation
Correct answer: A — Lithium
ALithium✓
BSertraline
CHaloperidol
DLorazepam
Why Lithium is correct
One week or more of decreased need for sleep, grandiosity, pressured speech, flight of ideas, and impulsive high-risk spending defines a manic episode; with no prior episodes this is a first presentation of bipolar I disorder.
Lithium is a first-line agent for acute mania per current CANMAT/ISBD guidance and also provides maintenance mood stabilization and a documented anti-suicide benefit.
The diagnosis must be established before treatment because antidepressant monotherapy is harmful in this setting.
Why the others are wrong
Sertraline — an SSRI; antidepressant monotherapy can precipitate or worsen mania and rapid cycling, the classic premature-closure trap of treating the picture as depression.
Haloperidol — a first-generation antipsychotic that can calm acute agitation but is not the preferred first-line agent; second-generation antipsychotics or mood stabilizers are favored, so this is a right-diagnosis-wrong-drug choice.
Lorazepam — a benzodiazepine useful as a short-term adjunct for agitation or insomnia but it does not treat the underlying mood disorder (symptomatic-anchoring trap).
Question 2PsychiatryMedium
A 22-year-old man has 3 weeks of decreased need for sleep, grandiosity, pressured speech, and excessive goal-directed activity, and he recently spent $50,000 on cryptocurrency. This is his first such episode. Urine toxicology is negative. Which of the following is the most likely diagnosis?
ASchizophrenia
BBipolar I, manic episode
CSchizoaffective disorder
DBorderline personality disorder
Reveal answer & full explanation
Correct answer: B — Bipolar I, manic episode
ASchizophrenia
BBipolar I, manic episode✓
CSchizoaffective disorder
DBorderline personality disorder
Why Bipolar I, manic episode is correct
A sustained period (here 3 weeks, well beyond the 1-week threshold) of decreased need for sleep, grandiosity, pressured speech, increased goal-directed activity, and impulsive spending meets criteria for a manic episode.
A single manic episode is sufficient to diagnose bipolar I disorder, regardless of any prior depression.
Acute mania is treated with a second-generation antipsychotic, lithium, or valproate; antidepressant monotherapy is avoided because it can precipitate mania or cycling.
Why the others are wrong
Schizophrenia — a primarily psychotic disorder; this presentation is a discrete mood episode with classic manic features rather than chronic psychosis. Sets the confused-with-psychosis trap.
Schizoaffective disorder — requires at least 2 weeks of delusions or hallucinations while no major mood episode is present; this man reports no psychotic symptoms at all, let alone any outside the mood episode. Sets the mood-plus-psychosis trap.
Borderline personality disorder — impulsive spending and mood shifts occur, but its affective instability lasts hours to a few days, is reactive to interpersonal stress, and is a lifelong trait pattern rather than a discrete 3-week episode with decreased need for sleep. Sets the impulsivity-equals-mania trap.
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Substance use, especially stimulants and cannabis in adolescence
Sleep disruption, jet lag, shift work — common precipitants
Childhood trauma associated with earlier onset and worse course
Pathophysiology
Polygenic risk with dysregulation of monoaminergic and glutamatergic systems, circadian rhythm instability, mitochondrial dysfunction, and altered intracellular signaling (GSK-3, inositol pathways — targets of lithium and valproate). Neuroimaging shows amygdala hyperactivity and reduced prefrontal regulation during mood episodes.
Clinical presentation
Symptoms
Manic episode: elevated, expansive, or irritable mood >=1 week with increased energy/activity
DIG FAST: Distractibility, Indiscretion (risky behaviors), Grandiosity, Flight of ideas, decreased need for Sleep, increased goal-directed Activity, increased Talkativeness/pressured speech
Psychotic features in severe mania — grandiose or persecutory delusions, mood-congruent hallucinations
Depressive episodes often predominate over a patient's lifetime
Mixed features — manic and depressive symptoms co-occurring; high suicide risk
Signs / physical exam
Pressured rapid speech, flight of ideas, tangential thought process
Hyperactivity, irritability, poor insight
Disheveled appearance with flamboyant dress in some cases
Cognitive impairment during acute episodes
Classic findings
Manic patient with reduced need for sleep (e.g., sleeping 2-3 hours and feeling rested), spending sprees, hypersexuality, and grandiose business plans.
Differential diagnosis
Major depressive disorder — No lifetime mania/hypomania; antidepressant monotherapy appropriate
Bipolar II disorder — Hypomania (>=4 days, no marked impairment, no psychosis, no hospitalization) plus MDE — never met full mania
Cyclothymic disorder — Chronic (>=2 years) subthreshold mood fluctuations not meeting MDE or hypomania criteria
Schizoaffective disorder — Psychotic symptoms >=2 weeks in the absence of mood symptoms
DSM-5-TR Bipolar I: At least one lifetime manic episode — distinct period (>=7 days, or any duration if hospitalized) of elevated/expansive/irritable mood AND increased goal-directed activity/energy, with >=3 DIG FAST symptoms (>=4 if mood is only irritable), causing marked impairment or psychotic features. The episode is not attributable to a substance or medical condition. MDE and hypomanic episodes are common but not required. Mood Disorder Questionnaire (MDQ) is a useful screening tool.
Labs
TSH, BMP, CBC, LFTs, urine drug screen, pregnancy test (women of reproductive age)
Lithium therapeutic range 0.6-1.2 mEq/L; toxicity >1.5 (tremor, ataxia, confusion); narrow therapeutic index — avoid NSAIDs, thiazides, ACEi (raise lithium).
Valproate teratogen — neural tube defects, autism, lower IQ. Contraceptive counseling essential; avoid in pregnancy and women of reproductive age unless no alternative.
Lamotrigine titration: increase no faster than every 2 weeks to prevent Stevens-Johnson syndrome.
Antidepressant-induced mania during treatment of an apparent unipolar depression is itself diagnostic of bipolar disorder.
Sleep deprivation reliably precipitates mania — sleep regularity is a core therapeutic target.
References
APA 2002 + guidance updates — American Psychiatric Association Practice Guideline for the Treatment of Patients with Bipolar Disorder, 2nd ed., with subsequent guidance
CANMAT/ISBD 2018 — Yatham LN et al. CANMAT and ISBD 2018 guidelines for the management of patients with bipolar disorder. Bipolar Disord 2018
DSM-5-TR — American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, 5th ed, Text Revision (2022)
BALANCE Trial — Geddes JR et al. Lithium plus valproate combination therapy versus monotherapy for relapse prevention in bipolar I disorder (BALANCE). Lancet 2010
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