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Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Bipolar I Disorder

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In one line

·Bipolar I is defined by one thing: at least one manic episode — a week or more of sky-high or cranky mood with relentless energy severe enough to wreck daily life, land you in the hospital, or make you lose touch with reality. Depression usually shows up too, but mania alone makes the diagnosis.

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Normal physiology

·Mood runs between a floor and a ceiling. The ventral tegmental area and nucleus accumbens (deep brain reward centers) and the locus coeruleus (the brain's wake-up alarm in the brainstem) release dopamine and norepinephrine (brain messengers that drive confidence, energy, and reward-seeking). The prefrontal cortex (the front of the brain that judges risk and pumps the brakes) and the suprachiasmatic nucleus (the tiny brain clock in the hypothalamus that runs your sleep-wake cycle) keep the system inside the band. Sleep is both the thermostat's readout and one of its main inputs.

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What goes wrong

·In a manic episode the ceiling fails. For at least one week — or any length if the hospital becomes necessary — mood runs abnormally sky-high, wide-open, or cranky WITH nonstop increased energy, nearly all day, every day. Sleep need collapses (two hours feels like plenty — the single most specific sign). Huge confidence inflates, speech speeds up and won't stop, thoughts race, attention scatters to every noise or sight, goal-driven activity multiplies, and judgment fails at full speed: spending sprees, business gambles, sexual risk. In severe mania, psychosis joins — huge false beliefs (like thinking you are famous or being watched) or hearing voices. This is the defining episode of bipolar I; most patients also cycle into major low episodes, but the manic episode alone is enough and required for the diagnosis.

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Hallmark signs

·Elevated, expansive, or irritable mood with increased energy or activity, lasting at least 1 week (or any length if hospitalized)
·Decreased need for sleep — feeling fully rested after only 2 or 3 hours
·Three or more of the DIGFAST symptoms (or four if the mood is only irritable): Distractibility, Impulsivity or risky behavior, Grandiosity (inflated self-esteem), Flight of ideas or racing thoughts, increased goal-directed Activity, pressured Speech, decreased need for sleep (Tachypsychia means speeded-up thinking)
·Psychotic features — grandiose or paranoid delusions (fixed false beliefs) or hallucinations (seeing or hearing things that are not there)
·Major depressive episodes — at least 2 weeks of low mood or loss of interest, plus at least five of nine symptoms (sleep change, appetite or weight change, low energy, trouble concentrating, feelings of worthlessness or guilt, thoughts of death or suicide, slowed movements or restlessness)
·Mixed features — depressive mood with manic energy, or manic mood with depressive thoughts, in the same episode
·Significant impairment in work, relationships, or daily function, or need for hospitalization to prevent harm

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Red flags · escalate now

·Decreased need for sleep with rising energy and mood — the classic early warning sign that a manic episode is starting; contact the treatment team the same day to adjust medication and prevent full relapse
·Psychotic symptoms such as grandiose delusions (believing you are God, a celebrity, or have superpowers) or paranoid delusions (believing others are plotting to harm you) — hospitalize immediately for safety and to start or increase antipsychotic medication
·Mixed features — depressive hopelessness or suicidal thoughts combined with manic energy, agitation, or sleeplessness — the highest-risk state for suicide in psychiatry; requires emergency evaluation, close monitoring, and often hospitalization
·Active suicidal plan or intent, especially during a depressive or mixed episode — emergency psychiatric evaluation and safety planning today; never send the person home alone
·Manic patient making irreversible decisions — signing contracts, quitting a job, giving away money, risky sexual behavior, reckless driving — intervene immediately to protect the person and assess decision-making capacity; involve family or legal safeguards as needed

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Workup

·DSM-5 manic-episode checklist (interview and chart review)
·Depression history (PHQ-9 score, timeline of past lows)
·Urine drug screen (cocaine, amphetamines, methamphetamine) and full medication list
·TSH (thyroid-stimulating hormone), basic metabolic panel (sodium, potassium, creatinine, glucose), and complete blood count (CBC)
·Mood Disorder Questionnaire (MDQ) and interview with family or close friend
·Urine or serum pregnancy test (hCG) before starting a mood stabilizer in anyone who can become pregnant
·Lithium level (drawn 12 hours after the last dose) once treatment starts
·Creatinine and estimated glomerular filtration rate (eGFR) every 6 to 12 months if on lithium

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Treatment

·Acute mania: keep the person safe (often in the hospital) and start fast mood control with lithium or valproate AND/OR an antipsychotic (olanzapine, risperidone, quetiapine, or aripiprazole)
·STOP any antidepressant (SSRI, SNRI, bupropion) as soon as mania starts
·Bipolar depression: use quetiapine, lurasidone, cariprazine, lamotrigine, or the olanzapine-fluoxetine combination—NOT an antidepressant by itself
·Long-term prevention: lithium is first choice (the only mood stabilizer proven to lower suicide risk), plus keep a regular sleep schedule and teach the person and family about the illness
·Electroconvulsive therapy (ECT) for mania or depression that does not respond to medicine, includes psychosis, or is immediately life-threatening
·Psychotherapy (cognitive-behavioral therapy, family-focused therapy, or interpersonal and social rhythm therapy) alongside medicine

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NCLEX trap

·One lifetime manic episode (a week or more of sky-high mood or extreme irritability plus racing thoughts, risky behavior, and little need for sleep) is all you need for bipolar I — depression happens in most people but is not required for the diagnosis. The mania is the defining event.
·Antidepressants are stopped during mania — they pour gasoline on the fire and can make the episode worse. Question the order and notify the provider; this is a classic med-safety trap.
·Decreased need for sleep (feeling fully rested on 3 hours) is a core manic symptom, not insomnia. The patient does not feel tired. The response is to manage the manic episode with meds and a calm space, not hand out sleep hygiene pamphlets.
·Antidepressant monotherapy (using an antidepressant alone) can flip a bipolar patient into mania. Bipolar depression gets quetiapine (Seroquel), lurasidone (Latuda), cariprazine (Vraylar), lamotrigine (Lamictal), or olanzapine-fluoxetine (Symbyax) — antidepressants are only used alongside a mood stabilizer, cautiously, never alone.
·Stimulation — noise, crowds, debate — escalates mania like turning up the volume. Provide a low-stimulation environment, brief calm one-on-one check-ins, and support for basic needs (fluids, finger foods, rest). Quiet protects the patient.
·Levels above 1.5 mEq/L are toxic no matter how the patient looks right now — toxicity can spiral fast. Hold lithium, assess for tremor, nausea, vomiting, stumbling (ataxia), confusion, or muscle twitching, push fluids if safe, and notify the provider immediately.
·Chronic non-stop irritability without distinct high-energy episodes points to DMDD (disruptive mood dysregulation disorder). Pediatric bipolar requires clear episodes of elevated mood or energy — days or weeks when the child is a totally different kid (super high, little sleep, big ideas) — a sharp change from baseline. The DMDD diagnosis exists precisely to stop this over-call.

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