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Clinical Reasoning · 10 min · Student

Perinatal Mood and Anxiety Disorders

The one-line truth

Baby blues is common and fades on its own within two weeks; if sadness or worry lasts longer or gets worse, it is a real mood disorder that needs treatment.

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Phase 1 · Understand the Body — Why the disease behaves the way it does.

The One-Line Truth

The whole disease in one chain

Everything on this page exists to explain this line.

Baby blues is common and fades on its own within two weeks; if sadness or worry lasts longer or gets worse, it is a real mood disorder that needs treatment.

The Factory Loses Its Power Supply

During pregnancy, the placenta is like a power plant steadily supplying electricity (estrogen and progesterone) to a mood-regulation factory (the brain). The factory uses this power to keep its assembly lines running smoothly: serotonin and dopamine workers manufacture 'happy' chemicals on schedule, the quality-control team (prefrontal cortex) catches problems before they ship, and the alarm system (amygdala) stays calm because it trusts everything is under control. The moment the baby is born, the power plant shuts down completely—the placenta is gone—and 90% of the electricity vanishes in 24 hours. The factory suddenly runs on backup power that is not enough, so the assembly lines slow, the quality-control team gets overwhelmed and goes offline, and the alarm system starts screaming at every shadow. Sleep deprivation is like asking the factory to run 24/7 without maintenance downtime, so broken parts pile up and cannot be repaired. If the mother had a faulty electrical system to begin with (bipolar disorder, prior depression), the power loss is catastrophic—the whole factory can catch fire (psychosis). Give the factory back its power supply (medication), let it sleep (support at night), and bring in extra workers (therapy, family help), and the factory stabilizes.

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ACOG Committee Opinion 757 (2018) Screening for Perinatal Depression · APA DSM-5-TR (2022) Diagnostic Criteria for Major Depressive Disorder with Peripartum Onset · USPSTF (2023) Recommendation on Perinatal Depression Screening · Cochrane Database Systematic Reviews (2021) Interventions for Preventing Postnatal Depression · reviewed 2026-07-07

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