Compare conditions

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

Bipolar Disorder

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In one line

·Bipolar disorder causes repeating cycles of sky-high energy and mood (mania or hypomania) and crushing low mood (major depression), all driven by broken control of dopamine, serotonin, and norepinephrine (brain chemical messengers) in the circuits that manage emotion and drive.

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Normal physiology

·In a healthy brain, the prefrontal cortex (the front planning and impulse-control center), the limbic system (deep emotion center including the amygdala, which flags danger, and hippocampus, which stores memories and regulates stress), and the striatum (reward and motivation hub) talk constantly using balanced levels of dopamine (the reward and drive messenger), serotonin (the mood-steadying messenger), and norepinephrine (the alertness and energy messenger). These circuits work like a thermostat, adjusting mood and energy up when you need motivation—like waking up to tackle a challenge—and down when you need rest, but always keeping everything inside a predictable, livable range.

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What goes wrong

·In bipolar disorder, the brain circuits that regulate mood and energy lose their ability to keep dopamine, serotonin, and norepinephrine inside a healthy range. Levels swing too high—flooding the striatum and prefrontal cortex and causing mania or hypomania (extreme energy, no need for sleep, risky behavior)—or crash too low, starving the same circuits and causing major depression (no energy, no joy, no motivation, sometimes thoughts of suicide). These swings happen without any reasonable outside cause, or a tiny trigger (like one sleepless night or a stressful week) sets off a huge mood change that lasts days to months.

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Hallmark signs

·Mania: sky-high mood or explosive anger lasting at least one week, bad enough to wreck work or land you in the hospital
·Hypomania: noticeably higher mood and energy lasting at least four days—people see the change but you can still function
·Barely needing sleep—feeling fully rested after only two or three hours
·Pressured speech: talking fast, loud, and nonstop so it's almost impossible to interrupt
·Flight of ideas or racing thoughts—your mind jumps from topic to topic without finishing any one idea
·Grandiosity: blown-up self-esteem, believing you have special powers, are famous, or can do impossible things
·Risky behavior: wild spending sprees, hypersexuality, reckless driving, or drug and alcohol binges
·Major depressive episodes: no pleasure in anything (anhedonia), crushing fatigue, feelings of worthlessness, and suicidal thoughts

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Red flags · escalate now

·Suicidal thoughts or behavior, especially during mixed episodes or in the first weeks of starting an antidepressant
·Psychotic symptoms—delusions or hallucinations—during mania
·Severe insomnia (no sleep for three or more days) or complete loss of insight (the person cannot recognize they are sick)
·Lithium toxicity signs: coarse hand tremor, confusion, slurred speech, muscle twitching, or seizures
·Rapid cycling—four or more mood episodes in one year—signaling treatment resistance and worse long-term outcome

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Workup

·Complete metabolic panel (CMP) including electrolytes (sodium, potassium, calcium), kidney function (creatinine, blood urea nitrogen BUN), liver enzymes (ALT, AST)
·Complete blood count (CBC) with differential
·Thyroid-stimulating hormone (TSH) and free thyroxine (free T4)
·Urine drug screen (UDS) for amphetamines, cocaine, cannabis, opioids, and benzodiazepines
·Pregnancy test (urine or serum β-hCG) in all people who could become pregnant
·Electrocardiogram (ECG) if planning to start lithium or certain antipsychotics
·Vitamin B12 and folate levels if there are signs of anemia or cognitive slowing
·HIV and hepatitis C screening if there is history of injection drug use or high-risk behavior

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Treatment

·Lithium started as mood stabilizer for acute mania or maintenance treatment to prevent future episodes
·Valproate (divalproex) started as mood stabilizer for acute mania or maintenance treatment
·Second-generation antipsychotic (such as quetiapine, lurasidone, olanzapine, aripiprazole, or cariprazine) for acute mania or bipolar depression
·Fixed sleep-wake schedule (same bedtime and wake time every day, including weekends; dark, quiet sleep environment; no screens 1 hour before bed; no daytime naps)
·Psychoeducation: teach the patient to identify their personal early warning signs (such as needing less sleep, increased spending, social withdrawal), understand bipolar disorder as a chronic medical condition like diabetes, and recognize the importance of medication adherence
·Interpersonal and social rhythm therapy (IPSRT): structured psychotherapy that regularizes daily routines (sleep, meals, exercise, social contact) to the same times each day
·Stable housing plus substance use disorder treatment (if alcohol or drug use is present) integrated into the care plan alongside mood disorder treatment

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NCLEX trap

·Antidepressants alone can flip the brain into a manic episode (suddenly feeling extremely happy, full of energy, and making risky choices) in people with bipolar disorder. The brain in bipolar swings between two extremes—too high and too low—like a broken thermostat. You need a mood stabilizer (lithium, valproate, or an antipsychotic medicine) to protect against both directions. Always pair an antidepressant with a mood stabilizer. The mood stabilizer acts like brakes so the antidepressant does not push the mood too high.
·Bipolar disorder is a pattern of mood episodes over time—not just one episode. One manic episode (feeling abnormally happy or irritable, with high energy, for at least 7 days) might be caused by cocaine, methamphetamine, steroids, a medical problem like hyperthyroidism (thyroid gland making too much hormone), or true bipolar I disorder. First, stop the acute manic symptoms with medicine. Second, investigate what caused the mania—check urine drug screen, thyroid-stimulating hormone (TSH, a blood test that checks thyroid function), complete blood count, and comprehensive metabolic panel. Third, ask about past episodes of depression. Then diagnose and plan long-term treatment.
·Mania (abnormally high mood with poor judgment) prevents clear thinking—the prefrontal cortex (the front part of the brain that pumps the brakes on impulses) is not working correctly. If the person is unsafe—spending all their money, having risky unprotected sex, driving dangerously, or unable to eat or sleep—starting medicine immediately is medically and ethically correct. Severe mania that threatens safety or the ability to care for yourself is a psychiatric emergency, like a diabetic coma. You treat the emergency first. You work on insight (helping the person understand they are sick) later, after the brain calms down.
·Lithium is the most evidence-based mood stabilizer (medicine that prevents mood swings) for bipolar disorder, but it is not the only option. The American Psychiatric Association guidelines also recommend valproate, lamotrigine, quetiapine, lurasidone, aripiprazole, and cariprazine. Bipolar disorder requires choosing the right medicine for the current mood phase—mania, depression, or mixed—and for the individual patient. For example, valproate works better than lithium for rapid cycling (four or more episodes per year). Lamotrigine works better for bipolar depression than for mania. Combine medicine with consistent sleep schedules, psychotherapy (talk therapy like cognitive-behavioral therapy), and social support.
·Bipolar disorder involves brain chemistry AND life circumstances. The brain circuits that control mood—involving the prefrontal cortex (planning and brakes), the amygdala (the brain's alarm center), and neurotransmitters like dopamine (reward and energy signal), serotonin (mood and sleep signal), and glutamate (brain's main go signal)—are dysregulated (not working correctly). Medicine stabilizes those circuits. But effective treatment also requires addressing social factors: stable housing, manageable job stress, good sleep environment (dark, quiet, consistent bedtime), family relationships, avoiding alcohol and drugs that trigger episodes, and regular therapy. Medicine alone treats only part of the illness. The brain needs help from both biology and environment to stay balanced.
·Mixed episodes (depression symptoms like sadness, hopelessness, and suicidal thoughts PLUS mania symptoms like high energy, racing thoughts, and irritability occurring together) are the most dangerous phase of bipolar disorder. The person has the energy from mania to act on suicidal thoughts from depression—like having a loaded gun and the will to use it. Increase the mood stabilizer or antipsychotic dose—do NOT add or increase antidepressants, which can worsen the mixed state and increase suicide risk. Monitor closely for self-harm and suicide risk. Consider inpatient hospitalization. This is a psychiatric emergency.

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