Compare conditions

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

Dysthymia (Persistent Depressive Disorder)

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In one line

·Dysthymia is depression as a climate instead of a storm — a low mood most of the day, more days than not, for at least two years, so constant that many patients stop calling it an illness and start calling it their personality.

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Normal physiology

·Mood tone is set by three brain messenger chemicals — serotonin (steadies mood and sleep), norepinephrine (powers alertness and motivation), and dopamine (drives pleasure and reward) — that flow continuously through the limbic system (the brain's emotion center) and the prefrontal cortex (the front of the brain that plans and judges). A healthy system lets sadness visit after losses and then restores a baseline where pleasure, energy, self-worth, and focus all work.

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What goes wrong

·In dysthymia the mood baseline itself sinks and stays sunk — like a dimmer switch turned down and stuck there. The person is depressed most of the day, more days than not, for at least two years (one year in children and adolescents, in whom the mood can look like constant crankiness rather than sadness). Riding along are at least two of: poor appetite or overeating, insomnia or sleeping too much (hypersomnia), low energy (fatigue that never lifts), low self-esteem (a steady belief that you are not good enough), poor concentration or trouble making decisions, and hopelessness (the belief that nothing will ever get better). The defining feature is persistence: during the whole period, the person is never free of symptoms for more than two months at a stretch. Because the drop is not as deep as major depression and life limps along, many people — and their doctors — miss it for years.

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Hallmark signs

·Depressed mood most of the day, more days than not, for at least 2 years (or 1 year in kids and teens — who may show irritability instead)
·Poor appetite or overeating
·Insomnia (trouble falling or staying asleep) or hypersomnia (sleeping too much)
·Low energy or fatigue
·Low self-esteem
·Poor concentration or trouble making decisions
·Feelings of hopelessness

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Red flags · escalate now

·Suicidal thoughts with a specific plan or intent to act — chronic hopelessness is one of the top predictors of suicide risk; assess safety and get mental health support the same day.
·A new, deeper depressive episode on top of the usual low mood (called 'double depression') — if the person suddenly can't function at work, school, or home, treat it as acute major depression right now.
·Any history of a manic or hypomanic episode (feeling extremely happy, needing little sleep, talking fast, risky behavior) — the diagnosis is actually bipolar disorder, not dysthymia, and starting an antidepressant alone can trigger mania; refer to psychiatry before starting medication.
·New confusion, unexplained weight change, feeling cold all the time, or very dry skin — check thyroid function (TSH blood test) before assuming it's all mood, because hypothyroidism (underactive thyroid) causes identical symptoms.
·Delusions (fixed false beliefs, especially about guilt or worthlessness) or hallucinations (hearing voices) — this is beyond dysthymia and means urgent psychiatric referral for possible psychotic depression.

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Workup

·DSM-5 duration and persistence criteria check
·DSM-5 symptom count — at least 2 of 6 accompanying symptoms
·DSM-5 exclusion audit — mania, hypomania, cyclothymia, and psychotic disorders
·TSH (thyroid-stimulating hormone), complete blood count (CBC), vitamin B12, vitamin D, and comprehensive metabolic panel
·PHQ-9 (Patient Health Questionnaire-9) score during worsening periods
·Alcohol and substance use timeline (AUDIT-C for alcohol, drug screen if indicated)
·Medication and medical history review for depression-inducing drugs

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Treatment

·Psychotherapy: cognitive behavioral therapy (CBT) or, specifically, CBASP (Cognitive Behavioral Analysis System of Psychotherapy), which was designed for chronic depression
·SSRI (selective serotonin reuptake inhibitor) antidepressant as first-line medication — sertraline, escitalopram, or fluoxetine
·Treat 'double depression' (a major depressive episode on top of dysthymia) as acute major depression when it happens
·Behavioral activation (structured scheduling of valued activities), regular aerobic exercise (at least 150 minutes per week), and sleep regularization (same bedtime and wake time every day)
·Long-term maintenance treatment (continuing antidepressant and psychotherapy for at least 2 years after symptoms improve)

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NCLEX trap

·The day-to-day sadness is less intense than in a major depressive episode, but because it never lifts for years—like a gray cloud that won't move—the total burden on school, work, and relationships often equals or exceeds episodic major depression. Chronic mild pain wears you down more than a single bad week. (DSM-5-TR, APA 2022.)
·The rule is 'most of the day, more days than not' for 2 years in adults (1 year in kids), and the person cannot go more than 2 months in a row without symptoms. A few good days or a week-long better stretch is still compatible with the diagnosis—the key is that relief never lasts longer than 2 months at once. (DSM-5-TR.)
·Children and teens need only 1 year—not 2—because their brains and lives are still developing and a year is a much longer proportion of their life so far. Also, instead of sadness, kids often show irritability—snapping, grumpy, or easily frustrated most days. (DSM-5-TR.)
·Both diagnoses stand together—this is called 'double depression.' The chronic low mood (persistent depressive disorder) stays in the background, and the major depressive episode is an acute crash on top of it. You treat the acute episode with the same urgency as any major depression (medication dose increase, close suicide monitoring), and then keep long-term treatment running for the persistent disorder underneath. (DSM-5-TR; APA Practice Guideline 2010.)
·The six symptom options for persistent depressive disorder are: (1) appetite too high or too low, (2) insomnia or sleeping too much, (3) low energy or tiredness, (4) low self-esteem, (5) poor concentration or trouble deciding, and (6) hopelessness. Anhedonia (loss of interest or pleasure), guilt, psychomotor slowing or agitation, and suicidal thoughts belong to the major depressive episode criteria—not the persistent depressive disorder list. Mixing up which symptom belongs to which list is a classic NCLEX trap. (DSM-5-TR.)

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