Clinical Approach to Postpartum Low Mood / Anxiety

Comprehensive Practical Framework

1
Symptom Overview
Overview
2
Pathophysiology
Mechanism
3
History Taking
History
4
Physical Examination
Examination
5
Differential Diagnosis
Differential
6
Investigations
Workup
7
Clinical Decision-Making
Algorithm
8
Pearls and Pitfalls
Summary

1. Symptom Overview

Understanding the clinical significance and classification of postpartum low mood and anxiety

Postpartum mood and anxiety disorders represent one of the most common complications of childbirth, affecting approximately 10 to 20% of women in the first year after delivery. Postpartum depression alone affects roughly 1 in 7 women, making it more prevalent than gestational diabetes. Despite this high prevalence, up to 50% of cases remain undiagnosed, and fewer than 25% of affected women receive adequate treatment. The consequences extend beyond maternal suffering to include impaired mother-infant bonding, adverse effects on child cognitive and emotional development, and increased risk of maternal suicide—which accounts for approximately 20% of postpartum deaths in developed countries.

Definition

Postpartum mood disorders encompass a spectrum of affective conditions occurring in the weeks to months following childbirth, ranging from transient “baby blues” to severe postpartum psychosis. Postpartum anxiety disorders include generalized anxiety, panic disorder, obsessive-compulsive symptoms, and post-traumatic stress disorder related to childbirth. These conditions frequently co-occur, with up to 70% of women with postpartum depression also experiencing significant anxiety symptoms.

Key Epidemiology

Postpartum blues: 50 to 85% of postpartum women (transient and self-limiting)
Postpartum depression: 10 to 15% of postpartum women
Postpartum anxiety disorders: 15 to 20% of postpartum women
Postpartum psychosis: 0.1 to 0.2% (1 to 2 per 1,000 deliveries)
Recurrence risk: 25 to 50% in subsequent pregnancies

Classification by Timing of Onset

Category	Timing	Common Conditions	Clinical Significance
Immediate Postpartum	Days 1 to 14	Postpartum blues, early postpartum psychosis	Blues are self-limiting; psychosis requires emergency intervention
Early Postpartum	2 weeks to 3 months	Postpartum depression, anxiety disorders, delayed psychosis	Peak onset period for depression; screening critical at 4 to 6 week visit
Late Postpartum	3 to 12 months	Persistent or late-onset depression, anxiety, adjustment disorders	Often missed; may present as somatic complaints or relationship difficulties

Classification by Severity

Severity	Functional Impairment	Typical Presentation	Management Level
Mild	Minimal; can perform daily activities with effort	Mood fluctuations, mild anxiety, some sleep disturbance beyond infant care	Primary care; supportive interventions, monitoring
Moderate	Significant difficulty with daily functioning and infant care	Persistent low mood, marked anxiety, difficulty bonding, appetite changes	Primary care with specialist input; consider pharmacotherapy
Severe	Unable to function; requires supervision for self-care and infant care	Suicidal ideation, inability to care for infant, severe anhedonia, psychomotor changes	Specialist psychiatric care; often requires pharmacotherapy
Psychotic	Complete; poses risk to self and/or infant	Delusions, hallucinations, disorganized behavior, rapid mood cycling	Psychiatric emergency; hospitalization typically required

Classification by Predominant Symptom Pattern

Depressive Predominant

Core features: Persistent sadness, anhedonia (loss of pleasure), hopelessness, guilt (often about parenting), worthlessness, fatigue beyond expected new-parent tiredness, psychomotor retardation or agitation.

Clinical implications: Screen for suicidal ideation and infanticidal thoughts. Assess bonding with infant. May present as withdrawal from infant care rather than overt sadness.

Anxiety Predominant

Core features: Excessive worry about infant health or safety, intrusive thoughts, hypervigilance, panic attacks, avoidance behaviors, physical symptoms of anxiety, difficulty sleeping even when infant is asleep.

Clinical implications: Distinguish from normal new-parent concerns. Intrusive thoughts of infant harm are common in obsessive-compulsive presentations and differ from psychotic symptoms. May present as excessive healthcare-seeking for infant.

Mixed Depression and Anxiety

Core features: Combined symptoms of depression and anxiety, often with irritability as a prominent feature. Agitation, emotional lability, and restlessness alongside low mood.

Clinical implications: Most common presentation (up to 70% of cases). May be misattributed to sleep deprivation or adjustment. Treatment must address both components.

Trauma-Related

Core features: Symptoms following traumatic birth experience—flashbacks, nightmares, avoidance of reminders, emotional numbing, hyperarousal. May include fear of future pregnancies.

Clinical implications: Often overlooked. Affects 3 to 15% of postpartum women. May avoid obstetric follow-up. Can occur even after objectively uncomplicated deliveries.

The Postpartum Mood Disorder Spectrum

Condition	Onset	Duration	Key Features	Prognosis
Postpartum Blues	Days 2 to 5	Hours to days; resolves by day 10 to 14	Mood lability, tearfulness, anxiety, irritability, sleep disturbance	Self-limiting; no treatment needed. If persists beyond 2 weeks, consider depression
Postpartum Depression	2 weeks to 12 months; peak at 2 to 3 months	Weeks to months; can persist for years if untreated	Depressed mood, anhedonia, guilt, worthlessness, sleep and appetite changes, suicidal ideation	Excellent with treatment; 80 to 90% response to therapy and/or medication
Postpartum Anxiety Disorders	Any time in first year; often early postpartum	Variable; often chronic without treatment	Excessive worry, panic, intrusive thoughts, hypervigilance, avoidance, somatic symptoms	Good with treatment; may require specific anxiety-focused interventions
Postpartum Psychosis	Days to weeks; 50% within first week	Weeks to months with treatment	Delusions, hallucinations, confusion, disorganization, rapid mood shifts, insomnia	Psychiatric emergency; good recovery with treatment but high recurrence risk

Key Concept: The Overlap Principle

Postpartum depression and anxiety rarely occur in isolation. Studies show that 50 to 70% of women with postpartum depression have comorbid anxiety symptoms, and anxiety symptoms may actually predominate in many cases. This has important implications:

Screen for both depression AND anxiety in all postpartum women
Treatment plans should address both symptom clusters
Comorbid anxiety may predict poorer response to antidepressant monotherapy
Irritability and agitation may be prominent features, not just sadness

Impact on Mother, Infant, and Family

Maternal Impact

Impaired self-care and recovery
Relationship difficulties
Reduced breastfeeding duration
Chronic mental health problems
Suicide risk (leading cause of maternal mortality in first year postpartum in developed countries)

Infant Impact

Impaired bonding and attachment
Cognitive developmental delays
Emotional regulation difficulties
Behavioral problems
Increased risk of child mental health disorders

Family Impact

Partner relationship strain
Increased risk of partner depression
Effects on older siblings
Economic burden
Intergenerational transmission of risk

2. Pathophysiology and Mechanisms

Understanding the underlying mechanisms of postpartum mood and anxiety disorders

The pathophysiology of postpartum mood and anxiety disorders is complex and multifactorial, involving the interplay of dramatic hormonal fluctuations, neurobiological changes, immune system alterations, psychological factors, and social stressors. Unlike any other time in life, the postpartum period involves the most rapid and profound hormonal changes a woman experiences, occurring against a backdrop of sleep deprivation, physical recovery, and the demands of newborn care. Understanding these mechanisms helps explain why some women are particularly vulnerable and guides targeted treatment approaches.

The Hormonal Cascade

Hormone	Change After Delivery	Mood-Related Effects	Clinical Relevance
Estrogen	Drops approximately 100 to 1000-fold within 3 to 4 days postpartum	Modulates serotonin, dopamine, and norepinephrine systems; affects neuroplasticity and neuroprotection	Rapid withdrawal may trigger mood symptoms in sensitive women; basis for estrogen-based therapies under investigation
Progesterone	Falls dramatically within 24 to 48 hours; reaches pre-pregnancy levels by day 5 to 7	Metabolite allopregnanolone is a potent GABA-A receptor modulator with anxiolytic and sedative properties	Allopregnanolone withdrawal contributes to anxiety; basis for brexanolone (synthetic allopregnanolone) treatment
Cortisol	Elevated during pregnancy; dysregulated hypothalamic-pituitary-adrenal axis postpartum	Stress response system alterations; affects mood, anxiety, and cognitive function	Hypothalamic-pituitary-adrenal axis dysfunction associated with depression; may explain stress sensitivity
Thyroid Hormones	Postpartum thyroiditis in 5 to 10% of women; fluctuations in first year	Both hypo- and hyperthyroidism can cause mood and anxiety symptoms	Screen thyroid function in all women with postpartum mood symptoms
Oxytocin	Released with breastfeeding and infant contact; variable levels postpartum	Promotes bonding, reduces stress response, has anxiolytic properties	Lower oxytocin levels associated with postpartum depression; breastfeeding may be protective in some women
Prolactin	Elevated with breastfeeding; inhibits gonadal axis	May contribute to fatigue; complex relationship with mood	Prolactin-secreting pituitary adenomas can mimic postpartum symptoms

Neurobiological Mechanisms

Monoamine Systems

Serotonin: Estrogen withdrawal reduces serotonin synthesis and receptor sensitivity. Tryptophan (serotonin precursor) is shunted toward kynurenine pathway during inflammation.

Dopamine: Reward circuitry changes affect motivation and pleasure. May contribute to anhedonia and reduced maternal motivation.

Norepinephrine: Dysregulated stress response and arousal. Contributes to anxiety and hypervigilance.

GABAergic System

GABA-A receptors: Pregnancy increases sensitivity to neurosteroids like allopregnanolone. Postpartum withdrawal creates relative GABA deficiency.

Clinical relevance: Explains acute anxiety and insomnia in early postpartum period. Basis for brexanolone mechanism of action.

Receptor plasticity: GABA-A receptor subunit composition changes during pregnancy and postpartum.

Inflammatory Pathways

Immune activation: Delivery triggers inflammatory response. Elevated cytokines (interleukin-6, tumor necrosis factor-alpha) associated with depression.

Neuroinflammation: Peripheral inflammation affects brain function via cytokine signaling.

Kynurenine pathway: Inflammation shunts tryptophan away from serotonin production toward neurotoxic metabolites.

The Biopsychosocial Vulnerability Model

Understanding Individual Vulnerability: Not all women who experience the hormonal cascade of childbirth develop mood disorders. The vulnerability model explains why some women are affected while others are not.

Domain	Risk Factors	Mechanism
Biological Vulnerability	Prior depression or anxiety, family history of mood disorders, history of premenstrual dysphoric disorder, prior postpartum depression	Increased sensitivity to hormonal fluctuations; genetic variants affecting neurotransmitter systems and hormone receptors
Psychological Vulnerability	Perfectionism, high anxiety sensitivity, negative cognitive style, history of trauma or abuse, unplanned pregnancy	Maladaptive coping, negative attributions about motherhood, difficulty adjusting to role changes
Social Vulnerability	Lack of partner support, social isolation, financial stress, recent life events, intimate partner violence	Reduced buffering against stress, inadequate practical support, chronic stress activation
Obstetric Factors	Complicated pregnancy or delivery, preterm birth, infant health problems, emergency cesarean section, traumatic birth	Physical trauma, prolonged stress response, separation from infant, thwarted expectations

Pathophysiological Differences by Condition

Condition	Primary Mechanisms	Treatment Implications
Postpartum Blues	Acute hormonal withdrawal, particularly progesterone and estrogen; sleep disruption; adjustment to new role	Self-limiting as hormonal milieu stabilizes; supportive care sufficient; monitor for progression to depression
Postpartum Depression	Sustained monoamine dysfunction; hypothalamic-pituitary-adrenal axis dysregulation; neurosteroid withdrawal; inflammatory activation; psychosocial stress	Responds to antidepressants targeting serotonin and norepinephrine; psychotherapy addresses cognitive factors; brexanolone targets neurosteroid pathway
Postpartum Anxiety Disorders	GABAergic deficiency from allopregnanolone withdrawal; hypothalamic-pituitary-adrenal axis hyperactivity; heightened amygdala reactivity; cognitive biases toward threat	SSRIs effective but may take weeks; benzodiazepines provide rapid relief but use caution with breastfeeding; cognitive behavioral therapy targets threat misinterpretation
Postpartum Obsessive-Compulsive Disorder	Intrusive thoughts about infant harm are ego-dystonic (distressing, unwanted); related to hyperresponsibility and anxiety rather than psychosis	SSRIs at higher doses often needed; exposure and response prevention therapy; reassurance that thoughts are common and do not indicate risk of acting on them
Postpartum Post-Traumatic Stress Disorder	Traumatic birth activates fear memory consolidation; hyperactive amygdala; impaired prefrontal regulation; conditioned fear responses to birth-related cues	Trauma-focused cognitive behavioral therapy; eye movement desensitization and reprocessing; SSRIs for symptom management
Postpartum Psychosis	Strong genetic component (bipolar diathesis); extreme sensitivity to sleep deprivation; possibly autoimmune or inflammatory mechanisms; dramatic circadian disruption	Psychiatric emergency requiring mood stabilizers and/or antipsychotics; restoration of sleep critical; electroconvulsive therapy highly effective; lithium prophylaxis in future pregnancies

The Critical Role of Sleep Deprivation

Sleep: The Often Overlooked Factor

Sleep deprivation is ubiquitous in the postpartum period but is frequently dismissed as an unavoidable aspect of new parenthood. However, sleep disruption is both a symptom and a cause of postpartum mood disorders:

Precipitant: Sleep deprivation can trigger mood episodes in vulnerable individuals; it is the most consistent precipitant of postpartum psychosis
Perpetuant: Ongoing sleep disruption prevents recovery and maintains mood and anxiety symptoms
Indicator: Insomnia despite opportunity to sleep (infant sleeping, partner available) is a red flag for depression
Treatment target: Protecting maternal sleep (partner taking night feeds, sleep banking) is a therapeutic intervention

Breastfeeding and Mood: A Complex Relationship

Potentially Protective Factors

Oxytocin release during feeding reduces stress response
Prolactin has anxiolytic properties in some women
Successful breastfeeding enhances maternal self-efficacy
Promotes bonding behaviors and infant contact

Potentially Harmful Factors

Breastfeeding difficulties cause significant distress and guilt
Night feeds disrupt maternal sleep architecture
Pressure to breastfeed can worsen guilt and anxiety
Some women experience dysphoric milk ejection reflex (D-MER)

Often Overlooked: Dysphoric Milk Ejection Reflex

Dysphoric Milk Ejection Reflex (D-MER) is a recently recognized condition in which women experience a brief but intense wave of negative emotions (dysphoria, anxiety, hollow feeling, dread, or irritability) immediately before milk letdown, lasting 30 seconds to 2 minutes. This is thought to be caused by the rapid drop in dopamine required to allow prolactin rise for milk release. It is often misdiagnosed as postpartum depression or dismissed entirely. Recognition is important because:

It is physiological, not psychological, and often responds to strategies that support dopamine (adequate hydration, rest, reducing stress)
It may improve with time as the breastfeeding reflex becomes less pronounced
Knowing the cause provides significant relief to affected women who may fear they are “rejecting” their baby

Genetic and Epigenetic Contributions

Factor	Evidence	Clinical Relevance
Heritability	Twin studies suggest 40 to 50% heritability for postpartum depression; family history increases risk 2 to 3 fold	Take detailed family psychiatric history; prior postpartum episodes in mother or sisters are particularly significant
Serotonin Transporter Gene	Short allele of 5-HTTLPR associated with increased risk, particularly with life stress	Gene-environment interaction: genetic vulnerability + stressful circumstances = increased risk
Estrogen Receptor Genes	Variants in ESR1 associated with differential mood response to hormonal changes	May explain why some women are exquisitely sensitive to reproductive hormone fluctuations (premenstrual dysphoric disorder, postpartum depression, perimenopausal depression)
Oxytocin System Genes	Variants in oxytocin receptor gene (OXTR) associated with postpartum depression and bonding difficulties	Potential future target for intervention; supports importance of behaviors that promote oxytocin release
Epigenetic Changes	Pregnancy and postpartum period involve significant epigenetic reprogramming; early life adversity in mother affects methylation patterns	Intergenerational transmission of risk; mother’s own childhood experiences affect her postpartum vulnerability

3. History Taking

A comprehensive approach to eliciting the postpartum mood and anxiety history

Red Flags — Require Urgent Evaluation

Suicidal ideation or plan — Immediate psychiatric evaluation; suicide is leading cause of maternal death in first year postpartum
Thoughts of harming the infant — Distinguish intrusive ego-dystonic thoughts (common in obsessive-compulsive disorder) from psychotic command hallucinations or delusions (rare but dangerous)
Psychotic symptoms — Hallucinations, delusions, disorganized thinking indicate postpartum psychosis; psychiatric emergency
Severe insomnia despite exhaustion — Unable to sleep even when infant is sleeping; may herald psychosis

Rapid mood cycling — Elation alternating with depression over hours to days suggests bipolar spectrum or emerging psychosis
Confusion or disorientation — May indicate psychosis, severe depression, or organic cause
Inability to care for self or infant — Severe functional impairment requires immediate intervention
Command hallucinations involving infant — Immediate separation and supervision required; highest risk scenario

Validated Screening Tools

Universal screening is recommended at the postpartum visit and throughout the first year. Key validated instruments include:

Edinburgh Postnatal Depression Scale (EPDS): 10 items; score ≥10 suggests possible depression; score ≥13 indicates probable depression; question 10 specifically asks about self-harm
Patient Health Questionnaire-9 (PHQ-9): 9 items; score ≥10 indicates moderate depression; widely used in primary care
Generalized Anxiety Disorder-7 (GAD-7): 7 items for anxiety; score ≥10 indicates moderate anxiety; often used alongside PHQ-9
Postpartum Specific Anxiety Scale (PSAS): 51 items assessing postpartum-specific anxiety domains

Note: A positive screen requires clinical follow-up—screening tools are not diagnostic.

Systematic History: The “MOTHER” Approach

Use the mnemonic “MOTHER” to ensure comprehensive history taking for postpartum mood and anxiety symptoms:

M — Mood and Mental State: Current mood, anxiety level, thoughts of self-harm or infant harm, psychotic symptoms, sleep pattern
O — Onset, Duration, and Course: When did symptoms begin? Sudden or gradual? Getting better, worse, or fluctuating?
T — Triggers and Timing: What precipitated symptoms? Relationship to delivery, breastfeeding, sleep deprivation, life events?
H — History (Psychiatric and Obstetric): Prior depression, anxiety, bipolar disorder, postpartum episodes, premenstrual dysphoric disorder, birth trauma
E — Environment and Support: Partner relationship, family support, financial stress, housing, intimate partner violence screening
R — Risk Factors and Resources: Risk assessment (suicide, infanticide), protective factors, current coping, treatment preferences, barriers to care

Key History Components in Detail

Current Symptom Assessment

Domain	Key Questions	What You’re Assessing
Mood	“How would you describe your mood most days?” “Do you feel sad, empty, or hopeless?” “Have you lost interest in things you used to enjoy?”	Depressed mood, anhedonia (core depression symptoms)
Anxiety	“Do you feel anxious or worried most of the time?” “What do you worry about?” “Do you have sudden episodes of intense fear or panic?”	Generalized anxiety, panic symptoms, specific fears
Intrusive Thoughts	“Do you have unwanted thoughts that pop into your head?” “Do you have scary thoughts about something bad happening to your baby?”	Obsessive-compulsive symptoms vs. psychotic symptoms (see differentiation below)
Sleep	“Can you sleep when the baby sleeps?” “Do you lie awake even when you have the chance to sleep?” “How many hours of sleep do you get in a 24-hour period?”	Insomnia independent of infant care (red flag); total sleep deprivation
Bonding	“How do you feel about your baby?” “Do you feel connected to your baby?” “Do you ever feel like you’re just going through the motions?”	Attachment difficulties, emotional numbing, guilt about bonding
Functioning	“Are you able to care for yourself?” “Are you able to care for your baby?” “Are you managing household tasks?”	Severity assessment; need for additional support
Appetite and Energy	“How is your appetite?” “Do you have the energy to get through the day?” “Have you noticed any weight changes?”	Neurovegetative symptoms of depression

Critical Distinction: Intrusive Thoughts vs. Psychotic Symptoms

Feature	Intrusive Thoughts (Obsessive-Compulsive)	Psychotic Symptoms
Nature	Ego-dystonic (distressing, unwanted, recognized as irrational)	Ego-syntonic (experienced as real, may be commanded by voices)
Content	“What if I accidentally drop the baby?” “What if I lose control?”	“The baby is possessed.” “I must sacrifice the baby.”
Response	Avoidance, checking, distress, seeks reassurance	May act on beliefs, lack of insight, possible planning
Risk	Very low risk of acting on thoughts (thoughts are the problem, not intent)	High risk if command hallucinations or delusions involving infant
Management	Reassurance, cognitive behavioral therapy, SSRIs	Psychiatric emergency, separation from infant, antipsychotics

Key Point: Up to 50% of new mothers experience intrusive thoughts about infant harm. These are common, distressing, and NOT associated with risk of harming the infant. Normalize these when appropriate while maintaining vigilance for true psychotic symptoms.

Targeted Questions by Suspected Condition

Suspected Condition	Key Features	Ask This Question
Postpartum Blues	Onset days 2-5, resolves by day 14, mood lability, tearfulness	“Did these feelings start within the first few days and get better within two weeks?”
Postpartum Depression	Persistent low mood, anhedonia, guilt, functional impairment	“Do you still enjoy anything?” “Do you feel like a bad mother even when others tell you you’re doing well?”
Postpartum Anxiety	Excessive worry, inability to relax, physical symptoms	“Can you ever relax, or do you always feel on edge?” “Do you check on the baby constantly even when you know they’re fine?”
Postpartum Panic Disorder	Sudden episodes of intense fear with physical symptoms	“Do you have sudden attacks where your heart races, you can’t breathe, and you feel like you might die or go crazy?”
Postpartum Obsessive-Compulsive Disorder	Intrusive thoughts, compulsive checking or avoidance behaviors	“Do you have repeated thoughts about bad things happening to the baby that you can’t get out of your head?” “Do you avoid certain activities because of these fears?”
Postpartum Post-Traumatic Stress Disorder	Traumatic birth, flashbacks, avoidance, hyperarousal	“Do you have nightmares or flashbacks about the delivery?” “Do you avoid thinking or talking about the birth?”
Postpartum Psychosis	Rapid onset, confusion, delusions, hallucinations, severe insomnia	“Do you hear voices that others don’t hear?” “Do you have any special beliefs about yourself or your baby?” “Have you been sleeping at all?”
Bipolar Disorder (New Onset or Recurrence)	History of mood episodes, family history, rapid cycling	“Have you ever had a period where you felt unusually energetic, needed less sleep, or felt like you could do anything?” “Is there bipolar disorder in your family?”
Thyroid Dysfunction	Mood changes with other thyroid symptoms	“Have you noticed any changes in your weight, temperature tolerance, heart rate, or energy that seem unusual?”

Psychiatric and Obstetric History

Past Psychiatric History

Prior depression or anxiety: Strongest predictor; ask about timing (postpartum, premenstrual, other)
Prior postpartum episodes: 25-50% recurrence risk; ask about prior pregnancies in detail
Bipolar disorder: High risk for postpartum psychosis; often presents postpartum for first time
Premenstrual dysphoric disorder: Indicates hormonal sensitivity; increased postpartum risk
Prior trauma or abuse: Increases vulnerability; may be retriggered by pregnancy/delivery
Previous psychiatric treatment: What worked? What didn’t? Preferences?
Suicide attempts: Prior attempts increase current risk

Obstetric History

This pregnancy: Planned? Complicated? Mood during pregnancy?
Delivery: Traumatic? Emergency cesarean? Prolonged labor? Hemorrhage?
Infant factors: Preterm? NICU admission? Health problems? Temperament?
Breastfeeding: Difficulties? Pressure? Guilt if not breastfeeding?
Prior pregnancies: Losses? Terminations? Prior postpartum mood episodes?
Fertility history: Difficulty conceiving? Assisted reproduction? (May affect expectations and guilt)

Family Psychiatric History

Key Family History Questions:

Depression, anxiety, or “nervous breakdowns” in first-degree relatives?
Bipolar disorder in family? (Critical for assessing psychosis risk)
Postpartum episodes in mother, sisters, maternal aunts?
Suicide in family?
Psychiatric hospitalizations?

Note: Family history of bipolar disorder significantly increases risk of postpartum psychosis even if patient has no prior mood episodes.

Social and Environmental Assessment

Domain	What to Assess	Why It Matters
Partner Relationship	Quality of relationship, partner support, partner’s mental health, conflict	Lack of partner support is major risk factor; partner depression common and affects mother
Intimate Partner Violence	Screen all women: “Do you feel safe at home?” “Has anyone hurt you or threatened you?”	Pregnancy and postpartum are high-risk periods; IPV strongly associated with depression
Social Support	Family nearby? Friends? Community? Help with infant care?	Social isolation is modifiable risk factor; support is protective
Financial Situation	Employment, income stability, housing security, food security	Financial stress exacerbates mood symptoms; affects treatment access
Life Events	Recent losses, moves, job changes, other stressors	Cumulative stress increases vulnerability
Cultural Factors	Cultural expectations of motherhood, family involvement, stigma around mental illness	Affects symptom expression, help-seeking, treatment acceptance

Medication and Substance History

Current Medications

Psychiatric medications: Were they stopped for pregnancy? Restarted postpartum?
Hormonal contraception: Recently started? Some women are mood-sensitive
Pain medications: Opioids from delivery can affect mood; may cause dependence
Supplements: Some herbal supplements affect mood; interactions with medications

Substance Use

Alcohol: May be using to cope; affects mood, sleep, breastfeeding
Cannabis: Increasingly common; can worsen anxiety, affects infant if breastfeeding
Tobacco: May have resumed after pregnancy; stress indicator
Other substances: Screen without judgment; affects treatment planning

Suicide and Safety Risk Assessment

Ask Directly About Suicide

Asking about suicide does NOT increase risk—it provides relief and opens dialogue. Use direct, non-judgmental questions:

“Have you had any thoughts that life isn’t worth living?”
“Have you thought about hurting yourself or ending your life?”
“Have you thought about how you might do it?” (assessing plan)
“Do you have access to medications, weapons, or other means?” (assessing means)
“Have you ever attempted suicide before?”
“What keeps you going?” (assessing protective factors)

Safety Assessment: Key Components

Suicidal ideation: Passive (“wish I wouldn’t wake up”) vs. active (“I want to kill myself”)
Plan: Has she thought about how? When? Where?
Means: Access to medications, firearms, other methods
Intent: How strong is the urge to act?
Protective factors: Reasons for living (baby, family, religious beliefs)
Thoughts about infant: Any thoughts of harming infant (distinguish obsessive-compulsive from psychotic)
Infant safety: Is infant being adequately cared for? Who else is available?

4. Physical Examination

A systematic approach for postpartum mood and anxiety symptoms

Systematic Framework: The physical examination in postpartum mood disorders serves two purposes: (1) ruling out organic causes of psychiatric symptoms, and (2) assessing the patient’s overall health status and self-care. While many psychiatric conditions have normal physical examinations, certain findings warrant further investigation.

Why Physical Examination Matters

Although postpartum mood and anxiety disorders are primarily psychiatric diagnoses, physical examination is important because:

Thyroid dysfunction occurs in 5-10% of postpartum women and mimics or exacerbates psychiatric symptoms
Anemia from delivery can cause fatigue and cognitive symptoms
Infection (endometritis, mastitis, urinary tract infection) can present with mood changes
Sheehan syndrome (pituitary infarction from postpartum hemorrhage) causes hormonal deficiencies
Self-neglect may be evident on examination and indicates severity
Physical complaints may be presenting symptoms of depression (somatization)

General Inspection and Mental Status

Observation	What to Look For	Clinical Significance
Appearance	Grooming, hygiene, dress appropriateness	Disheveled appearance suggests severe depression or psychosis; self-neglect indicates functional impairment
Eye Contact	Avoidant, normal, intense/staring	Poor eye contact in depression; intense staring may indicate psychosis or mania
Psychomotor Activity	Retardation (slowed movements, delayed responses) or agitation (restlessness, hand-wringing)	Retardation suggests severe depression; agitation may indicate anxiety, mixed state, or psychosis
Speech	Rate, volume, tone, latency	Slow, soft, monotone in depression; rapid/pressured in mania; disorganized in psychosis
Affect	Flat, restricted, labile, anxious, incongruent	Flat affect in severe depression; labile in blues or bipolar; anxious in anxiety disorders; incongruent in psychosis
Interaction with Infant	If present: eye contact with baby, responsiveness, handling, emotional tone	Detached interaction suggests bonding difficulties; anxiety may show hypervigilance; absence of infant at appointments may indicate avoidance

Vital Signs

Vital Sign	What to Look For	Clinical Significance
Temperature	Fever (>38°C / 100.4°F)	Suggests infection (endometritis, mastitis, urinary tract infection); infection can cause psychiatric symptoms
Heart Rate	Tachycardia (>100 bpm) or bradycardia (<60 bpm)	Tachycardia: anxiety, hyperthyroidism, infection, anemia. Bradycardia: hypothyroidism, severe depression with vagal tone
Blood Pressure	Hypertension (>140/90) or hypotension	Hypertension: preeclampsia/HELLP syndrome can have psychiatric manifestations; anxiety. Hypotension: Sheehan syndrome, dehydration
Respiratory Rate	Tachypnea, sighing respirations	Tachypnea with anxiety or panic; sighing respirations common in depression
Weight	Significant change from pre-pregnancy or recent	Excess weight retention: metabolic, thyroid. Significant loss: depression, hyperthyroidism, inadequate nutrition

Thyroid Examination

Do Not Miss Postpartum Thyroiditis

Postpartum thyroiditis affects 5-10% of women and is often mistaken for postpartum depression. It has a characteristic biphasic course:

Hyperthyroid phase (months 1-4): Anxiety, irritability, palpitations, tremor, weight loss, heat intolerance
Hypothyroid phase (months 4-8): Depression, fatigue, weight gain, cold intolerance, constipation, dry skin

Examine for: Goiter (thyroid enlargement), thyroid tenderness, tremor, tachycardia, hyperreflexia (hyperthyroid) or delayed relaxation phase of reflexes (hypothyroid)

Thyroid Examination Technique

Inspection: Observe neck for visible enlargement; ask patient to swallow while observing
Palpation: Stand behind patient; palpate thyroid lobes and isthmus for size, nodules, tenderness
Findings suggesting dysfunction: Goiter (diffuse or nodular), tenderness (thyroiditis), tremor, eye signs (though Graves’ disease is less common postpartum)

Systematic Examination by System

Head, Eyes, Ears, Nose, and Throat

Finding	What It May Indicate
Pale conjunctivae	Anemia (common postpartum, especially after hemorrhage)
Periorbital edema	Hypothyroidism, sleep deprivation, preeclampsia
Dry mucous membranes	Dehydration (common if not eating/drinking adequately)
Loss of lateral eyebrows	Hypothyroidism
Bitemporal hemianopia (visual field defect)	Sheehan syndrome (pituitary infarction) — rare but important

Cardiovascular Examination

Heart rate and rhythm: Tachycardia (anxiety, hyperthyroidism, anemia, infection), irregular rhythm (anxiety-associated palpitations vs. arrhythmia)
Heart sounds: Flow murmur (common in anemia); new murmur may indicate peripartum cardiomyopathy
Peripheral edema: May persist postpartum; excessive edema suggests cardiac, renal, or preeclampsia-related issues
Jugular venous pressure: Elevated in heart failure (peripartum cardiomyopathy)

Respiratory Examination

Respiratory pattern: Hyperventilation and sighing in anxiety; shallow breathing in panic
Lung sounds: Clear in most psychiatric conditions; crackles may indicate pulmonary edema (peripartum cardiomyopathy) or infection

Breast Examination

Engorgement: Can be painful and affect mood; may interfere with sleep
Mastitis: Erythema, warmth, tenderness; fever; can cause depression-like symptoms
Breast abscess: Fluctuant mass; may require drainage
Galactorrhea: If not breastfeeding, consider prolactinoma

Abdominal Examination

Uterine tenderness: Suggests endometritis; infection can cause mood symptoms
Fundal height: Should be involuting appropriately
Cesarean incision: Signs of infection (erythema, discharge, dehiscence)
Bowel sounds: Decreased in severe depression; constipation common

Neurological Examination

Finding	What It May Indicate
Tremor	Anxiety, hyperthyroidism, medication effect, essential tremor
Hyperreflexia	Hyperthyroidism, anxiety, preeclampsia/eclampsia
Delayed reflex relaxation	Hypothyroidism
Focal neurological signs	Cerebral venous thrombosis, stroke, intracranial pathology — rare but serious
Cognitive impairment	Severe depression, psychosis, delirium, Sheehan syndrome

Skin Examination

Dry skin, coarse hair: Hypothyroidism
Warm, moist skin: Hyperthyroidism, anxiety
Pallor: Anemia
Self-harm marks: Cuts, burns, scratches (may be in hidden areas — ask permission to examine forearms, thighs)
Hair loss: Telogen effluvium (normal postpartum) vs. hypothyroidism; can be distressing

Expected Findings by Condition

Condition	General/Mental Status	Key Physical Findings	Red Flags
Postpartum Depression	Flat affect, psychomotor retardation or agitation, poor eye contact, tearfulness	Usually normal; may show self-neglect, weight change	Self-harm marks, severe cachexia
Postpartum Anxiety	Anxious affect, restlessness, hypervigilance, rapid speech	Tachycardia, tremor, sweating, hyperventilation	Signs suggesting panic attack in progress
Postpartum Psychosis	Confusion, disorganization, bizarre behavior, labile or incongruent affect, poor insight	May be disheveled; may show signs of sleep deprivation; vital signs may be abnormal	Any focal neurological signs (rule out organic cause); severe agitation
Postpartum Thyroiditis — Hyperthyroid Phase	Anxious, irritable, may appear hypomanic	Tachycardia, tremor, warm moist skin, possible goiter, hyperreflexia, weight loss	Thyroid storm (rare): fever, severe tachycardia, altered mental status
Postpartum Thyroiditis — Hypothyroid Phase	Depressed affect, psychomotor slowing, cognitive dulling	Bradycardia, dry skin, periorbital edema, delayed reflexes, weight gain, goiter	Myxedema coma (rare): hypothermia, severe bradycardia, altered consciousness
Sheehan Syndrome	Fatigue, depression, cognitive impairment	History of severe postpartum hemorrhage; failure to lactate; signs of adrenal insufficiency (hypotension), hypothyroidism, hypogonadism	Adrenal crisis: hypotension, hypoglycemia, altered mental status
Postpartum Infection (Endometritis, Mastitis)	May appear unwell, fatigued; mood symptoms secondary to infection	Fever, tachycardia; uterine tenderness (endometritis) or breast erythema/tenderness (mastitis)	Sepsis: high fever, hypotension, altered mental status
Anemia	Fatigue, difficulty concentrating	Pallor (conjunctival, palmar), tachycardia, flow murmur	Severe anemia: dyspnea, chest pain, syncope

Important Teaching Point

Normal physical examination is common! Most women with postpartum depression and anxiety have completely normal physical examinations. A normal examination does not exclude significant psychiatric pathology. The purpose of the examination is to:

Rule out organic mimics (thyroid disease, anemia, infection, Sheehan syndrome)
Assess self-care as an indicator of severity
Screen for self-harm
Provide a complete clinical picture
Build rapport through the physical encounter

The mental status examination and history are more important than the physical examination for diagnosis, but the physical examination should not be omitted.

Note on Infant Assessment

While not strictly part of the maternal physical examination, if the infant is present, observe:

Infant’s general state: Well-nourished? Clean? Appropriately dressed?
Mother-infant interaction: Eye contact, responsiveness, affection, anxiety level
Infant’s behavior: Calm, fussy, difficult to console (may contribute to maternal distress)

If there are any concerns about infant welfare or safety, this must be addressed immediately according to local safeguarding protocols.

5. Differential Diagnosis

Systematic approach organized by probability and clinical features

The differential diagnosis of postpartum mood and anxiety symptoms requires distinguishing between normal adjustment, primary psychiatric disorders, and organic conditions that mimic psychiatric illness. A systematic approach considers timing of onset, symptom pattern, severity, and associated features to guide diagnosis and appropriate management.

Immediate Postpartum Period (Days 1-14)

Probability	Condition	Key Features	Red Flags
VERY COMMON (50-85%)	Postpartum Blues	Mood lability, tearfulness, anxiety, irritability; onset days 2-5; self-limiting by day 10-14; can still care for self and infant	Symptoms persisting beyond 2 weeks; severe functional impairment; suicidal ideation
LESS COMMON (5-10%)	Early Postpartum Depression	Persistent depressed mood, anhedonia, guilt, hopelessness; does not resolve spontaneously; functional impairment	Suicidal ideation, inability to care for infant, psychotic features
UNCOMMON BUT SERIOUS (0.1-0.2%)	Postpartum Psychosis	Rapid onset (often within first week); confusion, disorientation, delusions, hallucinations; severe insomnia; agitation or withdrawal; rapid mood shifts	Any psychotic symptom is a red flag; command hallucinations involving infant; disorganized behavior
UNCOMMON (variable)	Organic Causes	Postpartum thyroiditis (hyperthyroid phase), infection with delirium, eclampsia, cerebral venous thrombosis	Fever, focal neurological signs, seizures, severe headache, altered consciousness

Early Postpartum Period (2 Weeks to 3 Months)

Step-by-Step Approach:

Step 1: Screen all women using validated tools (Edinburgh Postnatal Depression Scale, Patient Health Questionnaire-9)
Step 2: Assess for “The Big Four” — Postpartum depression, generalized anxiety, panic disorder, obsessive-compulsive disorder
Step 3: Rule out organic mimics — thyroid dysfunction, anemia, infection
Step 4: Consider comorbidities — depression and anxiety commonly co-occur

Probability	Condition	Approximate Frequency	Key Distinguishing Features
COMMON	Postpartum Depression	10-15%	Persistent low mood, anhedonia, guilt (especially about parenting), worthlessness, fatigue beyond normal new-parent tiredness, sleep disturbance independent of infant, appetite changes, concentration difficulties, suicidal ideation
COMMON	Postpartum Generalized Anxiety Disorder	8-10%	Excessive, uncontrollable worry (often about infant health/safety); restlessness; muscle tension; difficulty relaxing; sleep disturbance; irritability
COMMON	Mixed Depression and Anxiety	Most common presentation (50-70% of cases have both)	Combined symptoms; irritability often prominent; may present with somatic complaints; agitated depression
LESS COMMON	Postpartum Panic Disorder	1-3%	Recurrent unexpected panic attacks (palpitations, sweating, trembling, dyspnea, chest pain, fear of dying/losing control); worry about future attacks; avoidance behaviors
LESS COMMON	Postpartum Obsessive-Compulsive Disorder	2-4%	Intrusive, unwanted thoughts (often about infant harm — dropping, drowning, sexual thoughts); ego-dystonic (distressing); compulsive checking, avoidance, reassurance-seeking; NO intent to act on thoughts
LESS COMMON	Postpartum Post-Traumatic Stress Disorder	3-15%	Following traumatic birth experience; flashbacks, nightmares; avoidance of reminders (including infant, hospital, subsequent pregnancy); hyperarousal; emotional numbing
LESS COMMON	Adjustment Disorder with Depressed or Anxious Mood	Variable	Symptoms in response to identifiable stressor; does not meet full criteria for major depression or anxiety disorder; symptoms resolve when stressor resolves or adaptation occurs
UNCOMMON	Bipolar Disorder (New Onset or Recurrence)	Variable; postpartum is high-risk period for first episode	History of mood episodes or family history of bipolar; mixed features (depression with agitation, racing thoughts); rapid cycling; poor response to antidepressant alone
UNCOMMON	Postpartum Thyroiditis	5-10%	Biphasic: hyperthyroid (months 1-4) then hypothyroid (months 4-8); mood symptoms match thyroid phase; other thyroid symptoms present

Late Postpartum Period (3-12 Months)

Probability	Condition	Key Features	Why It May Be Missed
COMMON	Persistent Postpartum Depression	Depression that began earlier and was untreated or undertreated; may have become chronic	Normalized as “just being a tired mom”; not screened beyond 6-week visit
COMMON	Late-Onset Postpartum Depression	New onset of depression 3-12 months postpartum; may coincide with weaning, return to work, sleep regression	Outside typical screening window; attributed to external stressors
LESS COMMON	Postpartum Thyroiditis — Hypothyroid Phase	Onset typically 4-8 months postpartum; depression, fatigue, weight gain, cognitive dulling	Symptoms attributed to postpartum depression; thyroid not retested
LESS COMMON	Chronic Anxiety Disorders	Generalized anxiety, panic disorder, or obsessive-compulsive symptoms that have become chronic	May be seen as personality trait or normal maternal worry
UNCOMMON	Sheehan Syndrome	Following severe postpartum hemorrhage; fatigue, depression, failure to lactate, amenorrhea, signs of hypopituitarism	Rare; requires high index of suspicion in women with hemorrhage history

Categorical Approach to Differential Diagnosis

Primary Mood Disorders

Postpartum Depression

Bipolar Disorder (depressive episode)

Bipolar Disorder (mixed episode)

Persistent Depressive Disorder

Adjustment Disorder with Depressed Mood

Primary Anxiety Disorders

Generalized Anxiety Disorder

Panic Disorder

Obsessive-Compulsive Disorder

Post-Traumatic Stress Disorder

Specific Phobias (related to infant)

Social Anxiety Disorder

Psychotic Disorders

Postpartum Psychosis

Bipolar I with Psychotic Features

Major Depression with Psychotic Features

Brief Psychotic Disorder

Schizophrenia (rare new onset)

Organic / Medical Causes

Postpartum Thyroiditis

Sheehan Syndrome

Anemia

Infection (endometritis, mastitis, UTI)

Cerebral Venous Thrombosis

Autoimmune Encephalitis (rare)

Organic Conditions That Mimic Postpartum Psychiatric Disorders

Condition	Psychiatric Symptoms	Distinguishing Features	Key Investigations
Postpartum Thyroiditis — Hyperthyroid Phase	Anxiety, irritability, insomnia, panic-like symptoms, mood lability	Palpitations, tremor, heat intolerance, weight loss despite good appetite; onset typically 1-4 months postpartum	Thyroid-stimulating hormone (TSH), Free T4, Free T3
Postpartum Thyroiditis — Hypothyroid Phase	Depression, fatigue, cognitive slowing, anhedonia	Cold intolerance, constipation, weight gain, dry skin, delayed reflexes; onset typically 4-8 months postpartum	TSH, Free T4; anti-thyroid peroxidase (TPO) antibodies
Sheehan Syndrome	Depression, fatigue, cognitive impairment, apathy	History of severe postpartum hemorrhage; failure to lactate; amenorrhea; hypotension; signs of adrenal, thyroid, or gonadal deficiency	Early morning cortisol, TSH, Free T4, FSH, LH, prolactin; MRI pituitary if suspected
Anemia	Fatigue, poor concentration, irritability, dyspnea on exertion	Pallor, tachycardia, history of hemorrhage; usually not associated with mood symptoms unless severe	Complete blood count, ferritin, iron studies
Infection (Endometritis, Mastitis, Urinary Tract Infection)	Delirium, confusion, agitation, mood changes	Fever, localizing symptoms (pelvic pain, breast erythema, dysuria); acute onset	Complete blood count, urinalysis, cultures as indicated
Cerebral Venous Thrombosis	Altered mental status, confusion, psychosis-like symptoms	Severe headache, seizures, focal neurological signs; postpartum is high-risk period	MRI with venography; D-dimer (may be elevated postpartum regardless)
Preeclampsia/Eclampsia (Late-Onset or Postpartum)	Confusion, agitation, visual disturbances	Hypertension, proteinuria, edema; can occur up to 6 weeks postpartum; seizures in eclampsia	Blood pressure, urinalysis, complete blood count, liver function tests, creatinine
Autoimmune Encephalitis	Psychosis, mood symptoms, cognitive impairment, personality change	Rapid onset; seizures; movement disorders; may be associated with ovarian teratoma (anti-NMDA receptor encephalitis)	Lumbar puncture, autoimmune encephalitis antibody panel, MRI brain, EEG

Substance-Related and Medication-Induced Mood Symptoms

Substance or Medication	Mood Effects	Characteristics	Management
Opioid Pain Medications	Depression, sedation, cognitive dulling; withdrawal causes anxiety, dysphoria	May have been prescribed for cesarean section or perineal trauma; dependence can develop quickly	Taper and discontinue when possible; assess for dependence
Alcohol	Depressant effects; anxiety during withdrawal; impaired sleep quality	May be used as coping mechanism; ask non-judgmentally; affects breastfeeding	Screen with AUDIT-C; brief intervention; refer if dependent
Cannabis	Anxiety, paranoia (especially high-THC strains); amotivational syndrome with heavy use	Increasingly common; may be perceived as harmless; affects infant if breastfeeding	Advise cessation; discuss alternatives for anxiety/sleep
Hormonal Contraception	Depression, mood lability in susceptible women	May have been started postpartum; progestin-only methods may be more likely to affect mood	Consider alternative contraception if temporal relationship
Discontinuation of Psychiatric Medications	Return of underlying depression or anxiety; discontinuation syndrome (SSRIs)	Women may have stopped medications during pregnancy; often not resumed postpartum	Resume effective medication with consideration of breastfeeding safety
Caffeine	Anxiety, insomnia, panic symptoms with excess; withdrawal causes fatigue, headache	May increase consumption due to fatigue; excessive intake can worsen anxiety	Assess intake; recommend moderation

Quick Reference: “If You See This, Think This”

Clinical Clue	Think This First	Next Step
Symptoms in first 2 weeks that resolve by day 14	Postpartum Blues	Reassurance; follow-up if symptoms persist
Persistent low mood beyond 2 weeks with guilt about parenting	Postpartum Depression	Formal assessment; consider treatment
Excessive worry about infant health, constant checking	Postpartum Anxiety or Obsessive-Compulsive Disorder	Distinguish generalized worry from intrusive thoughts
Intrusive thoughts of harming infant with distress and avoidance	Postpartum Obsessive-Compulsive Disorder	Reassure; thoughts are common and not dangerous; treat underlying anxiety
Sudden onset confusion, delusions, severe insomnia in first 2 weeks	Postpartum Psychosis	Psychiatric emergency; ensure safety of mother and infant
Flashbacks and nightmares about delivery	Postpartum Post-Traumatic Stress Disorder	Trauma-focused therapy referral
History of bipolar disorder with postpartum mood symptoms	Bipolar episode (may be depressed, manic, mixed, or psychotic)	Mood stabilizer indicated; avoid antidepressant monotherapy
Anxiety, palpitations, tremor, weight loss at 1-4 months	Postpartum Thyroiditis — Hyperthyroid Phase	Check TSH, Free T4
Depression, fatigue, weight gain, cold intolerance at 4-8 months	Postpartum Thyroiditis — Hypothyroid Phase	Check TSH, Free T4
Severe postpartum hemorrhage history with fatigue, failure to lactate, amenorrhea	Sheehan Syndrome	Pituitary hormone panel; MRI if confirmed

6. Diagnostic Investigations

A stepwise, cost-effective approach guided by clinical suspicion

The diagnosis of postpartum mood and anxiety disorders is primarily clinical, based on history and mental status examination. Laboratory investigations serve to rule out organic causes that can mimic or exacerbate psychiatric symptoms. A targeted approach prevents unnecessary testing while ensuring treatable medical conditions are not missed.

Baseline Investigations for All Patients

Rationale for Baseline Testing

Every woman presenting with postpartum mood or anxiety symptoms should have baseline investigations to rule out common organic mimics. Thyroid dysfunction and anemia are particularly prevalent in the postpartum period and are easily treated.

Investigation	Purpose	What to Look For	Practical Points
Thyroid-Stimulating Hormone (TSH)	Screen for thyroid dysfunction	Low TSH (hyperthyroid) or high TSH (hypothyroid); postpartum thyroiditis affects 5-10% of women	First-line screening test; if abnormal, add Free T4 and Free T3; consider repeating in 6-8 weeks as thyroiditis can evolve
Complete Blood Count (CBC)	Screen for anemia	Low hemoglobin (less than 12 g/dL); microcytic vs. normocytic anemia	Common after delivery, especially with hemorrhage; anemia causes fatigue, poor concentration, dyspnea
Ferritin	Assess iron stores	Low ferritin (less than 30 ng/mL suggests iron deficiency); can be low even with normal hemoglobin	Iron deficiency without anemia can cause fatigue and mood symptoms; ferritin is acute phase reactant so may be falsely normal with inflammation
Fasting Glucose or HbA1c	Screen for diabetes if gestational diabetes history or symptoms suggest	Elevated glucose; undiagnosed diabetes can cause fatigue, mood changes	Recommended postpartum screening for women with gestational diabetes; not routine for all
Vitamin D (25-hydroxyvitamin D)	Assess vitamin D status	Deficiency common, especially in northern latitudes; low levels associated with depression	Consider in women with risk factors (limited sun exposure, dark skin, covered dress); threshold for deficiency typically less than 20 ng/mL

Thyroid Function Testing in Detail

Key Point: Thyroid dysfunction is the most important organic mimic to rule out in postpartum mood disorders. Postpartum thyroiditis has a characteristic biphasic course, and a normal TSH at one time point does not exclude evolving thyroid dysfunction.

Test	When to Order	Interpretation
TSH	All patients with postpartum mood/anxiety symptoms	Low: suggests hyperthyroidism (thyroiditis, Graves’); High: suggests hypothyroidism
Free T4	If TSH abnormal; or if high clinical suspicion despite normal TSH	High with low TSH confirms hyperthyroid; Low with high TSH confirms hypothyroid
Free T3	If hyperthyroidism suspected (T3 toxicosis can occur)	May be elevated in hyperthyroid states even when Free T4 is normal
Anti-Thyroid Peroxidase (TPO) Antibodies	If thyroid dysfunction confirmed or high risk	Elevated in autoimmune thyroid disease; predicts progression to permanent hypothyroidism in thyroiditis
Thyroid-Stimulating Immunoglobulin (TSI)	If hyperthyroidism confirmed and Graves’ disease suspected	Elevated in Graves’ disease; helps distinguish from thyroiditis (typically TSI negative)

Repeat Thyroid Testing

If initial thyroid function is normal but clinical suspicion remains, or if postpartum thyroiditis is diagnosed in the hyperthyroid phase, repeat TSH in 6-8 weeks. The hypothyroid phase typically follows and may require treatment.

Targeted Investigations by Clinical Suspicion

If Suspecting Postpartum Psychosis

Investigations in Postpartum Psychosis

Postpartum psychosis is a psychiatric emergency, but organic causes of acute psychosis must be excluded. Consider:

Complete metabolic panel: Electrolyte abnormalities, renal/hepatic dysfunction
Complete blood count: Infection, severe anemia
Thyroid function tests: Thyroid storm can present with psychosis
Urinalysis and urine drug screen: Infection, substance use
Blood cultures: If fever present
CT or MRI brain: If focal neurological signs, severe headache, or atypical presentation
Lumbar puncture: If meningitis/encephalitis suspected (fever, neck stiffness, altered consciousness)
Autoimmune encephalitis antibody panel: If subacute onset, seizures, movement disorders, or poor response to psychiatric treatment

If Suspecting Sheehan Syndrome

First-Line Tests

Early morning cortisol: Low (less than 3 μg/dL) suggests adrenal insufficiency; if 3-15 μg/dL, proceed to stimulation testing
TSH and Free T4: May show central hypothyroidism (low Free T4 with inappropriately normal or low TSH)
FSH, LH, Estradiol: Low gonadotropins with low estradiol suggests hypogonadotropic hypogonadism
Prolactin: May be low (explains failure to lactate); contrast with prolactinoma where it’s elevated

Second-Line Tests

ACTH stimulation test: To confirm adrenal insufficiency
IGF-1: Screens for growth hormone deficiency
MRI pituitary with contrast: Shows empty sella or partially empty sella
Endocrinology referral: For comprehensive pituitary function assessment

If Suspecting Anemia as Primary Cause

First-Line Tests

Complete blood count: Hemoglobin, MCV (microcytic vs. normocytic vs. macrocytic)
Reticulocyte count: Assess bone marrow response
Ferritin: Iron deficiency (most common postpartum)
Iron studies: Serum iron, TIBC, transferrin saturation

Second-Line Tests

Vitamin B12 and Folate: If macrocytic anemia
Peripheral blood smear: If anemia etiology unclear
Hemoglobin electrophoresis: If thalassemia suspected

If Suspecting Infection

Suspected Infection	Investigations	Key Findings
Endometritis	Complete blood count, blood cultures if febrile, endometrial cultures (if indicated)	Leukocytosis, fever, uterine tenderness; usually clinical diagnosis
Mastitis/Breast Abscess	Complete blood count; ultrasound if abscess suspected; milk culture if not responding to treatment	Leukocytosis; ultrasound shows fluid collection if abscess
Urinary Tract Infection	Urinalysis, urine culture	Pyuria, bacteriuria, positive culture
Wound Infection (Cesarean or Perineal)	Wound culture if purulent drainage; complete blood count	Clinical diagnosis; culture guides antibiotic choice

If Suspecting Cerebral Venous Thrombosis

When to Suspect Cerebral Venous Thrombosis

Postpartum period is high risk for cerebral venous thrombosis. Suspect if:

Severe, unusual headache (often diffuse or positional)
Seizures (especially new-onset)
Focal neurological deficits
Altered mental status, confusion, psychosis-like symptoms
Papilledema

Investigations:

MRI brain with MR venography: Gold standard; shows thrombus and any venous infarction
CT venography: Alternative if MRI not available
D-dimer: May be elevated but is often elevated postpartum regardless; a negative D-dimer has limited utility in this population

Validated Screening Instruments

While not laboratory investigations, validated screening tools are essential diagnostic instruments for postpartum mood and anxiety disorders.

Instrument	What It Screens For	Scoring	Practical Notes
Edinburgh Postnatal Depression Scale (EPDS)	Postpartum depression; also captures anxiety symptoms	10 items; 0-30 score; ≥10 possible depression; ≥13 probable depression; Question 10 asks about self-harm	Most widely validated for postpartum use; available in many languages; brief (5 minutes); recommended by ACOG for universal screening
Patient Health Questionnaire-9 (PHQ-9)	Depression severity	9 items; 0-27 score; 5-9 mild, 10-14 moderate, 15-19 moderately severe, 20-27 severe depression	Maps to DSM criteria; widely used in primary care; tracks treatment response; Question 9 asks about suicidal ideation
Generalized Anxiety Disorder-7 (GAD-7)	Anxiety severity	7 items; 0-21 score; 5-9 mild, 10-14 moderate, ≥15 severe anxiety	Brief; complements PHQ-9; useful for detecting comorbid anxiety
PHQ-4	Ultra-brief screen for depression and anxiety	4 items (first 2 questions of PHQ-9 and GAD-7); ≥3 positive screen	Very brief; useful for initial screening; positive result should trigger full PHQ-9 and GAD-7
Perinatal Anxiety Screening Scale (PASS)	Perinatal anxiety specifically	31 items; captures general anxiety, specific fears, perfectionism, social anxiety	More comprehensive for anxiety; research setting primarily
City Birth Trauma Scale	Birth-related PTSD symptoms	29 items assessing trauma symptoms related to childbirth	Use when birth trauma suspected; helps identify PTSD

Empiric Treatment Trials as Diagnostic Tools

Treatment Response as Diagnostic Confirmation

In postpartum mood and anxiety disorders, empiric treatment trials can serve as both therapeutic and diagnostic tools:

Postpartum depression: Response to antidepressant therapy within 4-6 weeks supports diagnosis
Postpartum anxiety: Response to SSRI or cognitive behavioral therapy supports diagnosis
Postpartum obsessive-compulsive disorder: Response to SSRI (often at higher doses) with exposure and response prevention supports diagnosis
Hypothyroidism: Resolution of depressive symptoms with thyroid hormone replacement confirms contribution of thyroid dysfunction
Iron deficiency: Improvement in fatigue and mood with iron supplementation supports diagnosis (though response may take weeks)

Important: Lack of response should prompt reconsideration of diagnosis, assessment of comorbidities, and evaluation of treatment adherence.

Investigation Algorithm Summary

Stepwise Approach to Investigations:

All patients: TSH, complete blood count, ferritin; consider vitamin D
If TSH abnormal: Free T4, Free T3, TPO antibodies; consider endocrinology referral
If psychosis present: Comprehensive metabolic panel, urinalysis, urine drug screen; consider CT/MRI brain, lumbar puncture if atypical features
If severe postpartum hemorrhage history with suggestive symptoms: Morning cortisol, full pituitary panel, MRI pituitary
If focal neurological signs or severe headache: MRI brain with venography to exclude cerebral venous thrombosis
If fever or localizing symptoms: Appropriate cultures and imaging for suspected infection site

7. Pattern Recognition and Clinical Decision-Making

Practical algorithms and decision pathways

Step 1: Is This Urgent?

Clinical Scenario	Urgency Level	Immediate Action
Suicidal ideation with plan or intent	EMERGENT	Do not leave patient alone; arrange immediate psychiatric evaluation; consider emergency department; ensure infant safety
Psychotic symptoms (delusions, hallucinations, confusion)	EMERGENT	Psychiatric emergency; arrange immediate evaluation; do not leave mother alone with infant; consider hospitalization
Command hallucinations involving infant harm	EMERGENT	Immediate separation from infant; emergency psychiatric admission; highest risk scenario
Severe agitation or bizarre behavior	EMERGENT	Ensure safety of mother and infant; emergency psychiatric evaluation; rule out organic causes
Inability to care for self or infant	URGENT	Arrange support for infant care; same-day psychiatric assessment; consider respite or admission
Suicidal ideation without plan (passive)	URGENT	Same-day or next-day mental health assessment; safety planning; mobilize support; close follow-up
Severe depression with marked functional impairment	URGENT	Expedited mental health referral (within days); consider starting treatment in primary care; ensure adequate support
Severe anxiety with panic attacks affecting infant care	URGENT	Expedited mental health referral; consider starting SSRI or short-term benzodiazepine; arrange support
Moderate depression or anxiety with intact functioning	ROUTINE	Mental health referral within 1-2 weeks; consider initiating treatment in primary care; psychoeducation; follow-up arranged
Mild symptoms, good support, no safety concerns	ROUTINE	Supportive counseling; psychoeducation; watchful waiting with scheduled follow-up; peer support resources

Step 2: Classify by Timing of Onset

Days 1-14 Postpartum

Consider:

Postpartum blues (most common)
Early postpartum depression
Postpartum psychosis (rare but urgent)
Organic causes (infection, thyroid)

Proceed to Algorithm A

2 Weeks to 3 Months

Consider:

Postpartum depression
Anxiety disorders
Obsessive-compulsive disorder
Post-traumatic stress disorder
Thyroiditis (hyperthyroid phase)

Proceed to Algorithm B

3-12 Months Postpartum

Consider:

Persistent/chronic depression
Late-onset depression
Chronic anxiety disorders
Thyroiditis (hypothyroid phase)
Sheehan syndrome

Proceed to Algorithm C

Step 3: Follow the Appropriate Algorithm

Algorithm A: Immediate Postpartum (Days 1-14)

Clinical Scenario	Most Likely Diagnosis	Action
Mood lability, tearfulness, anxiety starting days 2-5, able to function, no safety concerns	Postpartum Blues	Reassurance; educate that this is normal and self-limiting; ensure support; schedule follow-up at 2 weeks to confirm resolution
Blues symptoms not resolving by day 10-14 OR worsening over time	Evolving Postpartum Depression	Formal assessment with EPDS/PHQ-9; baseline labs (TSH, CBC); consider early treatment initiation; mental health referral
Confusion, disorientation, delusions, hallucinations, severe insomnia, rapid mood shifts	Postpartum Psychosis	Psychiatric emergency; do not leave alone with infant; immediate psychiatric evaluation; likely requires hospitalization
Mood symptoms with fever, uterine tenderness, or breast erythema	Infection (endometritis, mastitis) with secondary mood effects	Treat infection; reassess mood after infection resolves; mood symptoms often improve with treatment of underlying infection
Severe headache with mood/cognitive changes, especially with focal signs	Consider cerebral venous thrombosis or late preeclampsia/eclampsia	Urgent neuroimaging; blood pressure check; neurological examination; may need emergency department evaluation

Algorithm B: Early Postpartum (2 Weeks to 3 Months)

Clinical Scenario	Most Likely Diagnosis	Action
Persistent low mood, anhedonia, guilt about parenting, functional impairment	Postpartum Depression	Baseline labs (TSH, CBC); initiate SSRI and/or refer for therapy; safety assessment; follow-up in 2 weeks
Excessive worry about infant, inability to relax, physical tension, poor sleep even when infant sleeps	Postpartum Generalized Anxiety Disorder	Consider SSRI (also treats depression if comorbid); refer for cognitive behavioral therapy; psychoeducation about anxiety
Recurrent panic attacks with fear of future attacks, avoidance of triggers	Postpartum Panic Disorder	SSRI first-line; consider short-term benzodiazepine for acute symptoms if not breastfeeding or with informed discussion; cognitive behavioral therapy
Intrusive unwanted thoughts of infant harm causing distress; checking, avoidance, reassurance-seeking	Postpartum Obsessive-Compulsive Disorder	Reassure that thoughts are common and do not indicate danger; SSRI (often higher doses needed); refer for exposure and response prevention therapy
Flashbacks, nightmares about delivery; avoidance of birth-related reminders; hyperarousal	Postpartum Post-Traumatic Stress Disorder	Validate experience; refer for trauma-focused therapy (cognitive processing therapy, eye movement desensitization and reprocessing); SSRI for symptom management
Anxiety, palpitations, tremor, weight loss, heat intolerance	Postpartum Thyroiditis — Hyperthyroid Phase	Check TSH, Free T4; if hyperthyroid, beta-blocker for symptoms; usually self-limiting; monitor for hypothyroid phase in 2-3 months
Depression with agitation, racing thoughts, decreased need for sleep, history/family history of bipolar	Bipolar Disorder (mixed or depressive episode)	Avoid antidepressant monotherapy; urgent psychiatric referral; mood stabilizer indicated; monitor closely

Algorithm C: Late Postpartum (3-12 Months)

Clinical Scenario	Most Likely Diagnosis	Action
Depression that began earlier and never fully resolved	Persistent Postpartum Depression	Assess current treatment adequacy; consider dose adjustment, augmentation, or medication change; intensify therapy; screen for comorbidities
New onset of depression at 3+ months, possibly coinciding with weaning, return to work, or sleep regression	Late-Onset Postpartum Depression	Full evaluation as for any new depression; baseline labs including thyroid; initiate treatment; explore precipitating factors
Fatigue, depression, weight gain, cold intolerance, cognitive slowing at 4-8 months	Postpartum Thyroiditis — Hypothyroid Phase	Check TSH, Free T4; if hypothyroid and symptomatic, consider levothyroxine; recheck in 6-12 months as many recover spontaneously
History of severe postpartum hemorrhage with fatigue, failure to lactate, amenorrhea, hypotension	Sheehan Syndrome	Pituitary hormone panel; endocrinology referral; MRI pituitary if confirmed; hormone replacement as needed
Chronic anxiety that has become entrenched, avoidance patterns, functional limitation	Chronic Anxiety Disorder	Comprehensive reassessment; optimize medication; refer for structured cognitive behavioral therapy; address maintaining factors

Step 4: Treatment Selection Algorithm

Key Treatment Decision Points:

Is this an emergency? If psychosis, active suicidality, or inability to care for infant → Immediate psychiatric evaluation, consider hospitalization
Is the patient breastfeeding? Affects medication choice; most SSRIs compatible with breastfeeding (sertraline preferred); discuss risks and benefits
What is the severity? Mild → Consider watchful waiting, therapy alone; Moderate → Therapy and/or medication; Severe → Medication plus therapy, consider intensive outpatient or inpatient
Is there prior treatment history? What worked before? What didn’t? Any adverse effects?
Is there comorbid anxiety? Very common; SSRIs treat both; ensure adequate dose for anxiety
Any bipolar features or history? Avoid antidepressant monotherapy; mood stabilizer needed; psychiatric referral

Condition	First-Line Treatment	Second-Line or Adjunctive	Considerations
Postpartum Depression (mild)	Psychotherapy (cognitive behavioral therapy, interpersonal therapy); supportive counseling	SSRI if no improvement or patient preference	Ensure adequate support; address sleep; follow-up in 2-4 weeks
Postpartum Depression (moderate-severe)	SSRI (sertraline preferred if breastfeeding) PLUS psychotherapy	Increase dose if partial response; switch SSRI or add augmentation; consider brexanolone for severe cases	Start low, go slow; allow 4-6 weeks for full effect; continue 6-12 months after remission
Postpartum Anxiety	SSRI (sertraline, escitalopram) PLUS cognitive behavioral therapy	Increase dose (anxiety often needs higher doses than depression); consider buspirone adjunct; short-term benzodiazepine if severe	Warn that SSRIs may initially increase anxiety; start at low dose; benzodiazepines: discuss breastfeeding implications
Postpartum Obsessive-Compulsive Disorder	SSRI (often higher doses: sertraline 150-200mg, fluoxetine 60-80mg) PLUS exposure and response prevention therapy	Add low-dose antipsychotic augmentation if partial response	Reassure about intrusive thoughts; ERP is critical component; may take 8-12 weeks for SSRI effect
Postpartum Post-Traumatic Stress Disorder	Trauma-focused cognitive behavioral therapy or eye movement desensitization and reprocessing (EMDR)	SSRI for symptom management; prazosin for nightmares if severe	Validate traumatic experience; avoid forcing trauma discussion before patient ready; ensure safety
Postpartum Psychosis	Hospitalization; antipsychotic (often olanzapine or quetiapine); mood stabilizer if bipolar features	Electroconvulsive therapy (highly effective and rapid); lithium for maintenance and future prophylaxis	Psychiatric emergency; do not treat as outpatient initially; breastfeeding usually interrupted; high recurrence risk
Bipolar Depression (Postpartum)	Mood stabilizer (lamotrigine, lithium) or atypical antipsychotic (quetiapine)	Combination mood stabilizer plus atypical; avoid antidepressant monotherapy	Psychiatric referral; lithium is effective but requires monitoring and breastfeeding discussion; quetiapine often used

“What Do I Do If…” Decision Reference

Clinical Situation	Immediate Action	Next Step
Patient discloses suicidal ideation	Do not end consultation; assess plan, intent, means, protective factors; ask directly about infant safety	If high risk: do not leave alone, arrange emergency evaluation. If lower risk: safety plan, means restriction, crisis resources, close follow-up
Patient reports intrusive thoughts of harming infant	Stay calm; determine if ego-dystonic (OCD) vs. ego-syntonic (psychotic); ask if she has any urge to act on thoughts	If OCD (distressed by thoughts, no intent): reassure, initiate treatment. If psychotic features: psychiatric emergency
Patient refuses medication due to breastfeeding concerns	Validate concerns; provide accurate information about medication safety; discuss risks of untreated illness	Shared decision-making; offer therapy as alternative if appropriate; if medication needed, sertraline has best breastfeeding data; involve lactation consultant
SSRI not working after 6 weeks at adequate dose	Reassess diagnosis (comorbidities? bipolar? substance use? medical cause?); confirm adherence	Options: increase dose, switch to different SSRI, switch to SNRI, add augmentation (buspirone, low-dose atypical), add psychotherapy if not already
Patient has history of bipolar disorder and presents with postpartum depression	Do NOT start antidepressant monotherapy; assess for mixed features or emerging mania	Urgent psychiatric referral; mood stabilizer or atypical antipsychotic first-line; close monitoring for mood destabilization
Patient improving but wants to stop medication early	Discuss relapse risk (high in first 6 months after remission); explore reasons for wanting to stop	Recommend continuing for 6-12 months after remission; if insistent, taper slowly over weeks to months; plan for early warning signs
Concern about infant safety/neglect	Assess infant’s current status and care; determine available support; assess mother’s capacity	If immediate risk: arrange alternative care for infant, involve child protective services as indicated by local protocols; if supportive intervention sufficient: mobilize family/community support
Partner/family member reports worsening symptoms that patient minimizes	Take collateral information seriously; interview patient alone but also acknowledge family concern	More frequent follow-up; involve family in safety planning (with patient consent); lower threshold for intervention

Troubleshooting Treatment-Resistant Postpartum Depression

Ask These Questions When Treatment Isn’t Working

Is the diagnosis correct? Reconsider bipolar disorder, anxiety disorder, PTSD, medical causes (thyroid, anemia), substance use
Is the dose adequate? Many patients are undertreated; anxiety often requires higher doses
Has sufficient time elapsed? Allow 4-6 weeks at therapeutic dose before concluding failure
Is adherence good? Ask non-judgmentally; common barriers include side effects, stigma, breastfeeding concerns
Are there untreated comorbidities? Anxiety, PTSD, OCD, substance use, insomnia may require additional or different treatment
Are psychosocial factors addressed? Treatment can only do so much if partner abuse, financial crisis, or severe isolation persist
Is psychotherapy included? Medication alone is often insufficient for moderate-severe depression
Is sleep being addressed? Chronic sleep deprivation prevents recovery; practical support for sleep essential

8. Clinical Pearls and Pitfalls

Practical wisdom — learn from successes and avoid common mistakes

Must-Know Clinical Pearls

Postpartum depression and anxiety usually co-occur: Up to 70% of women with postpartum depression have significant anxiety symptoms. Screen for both, and choose treatments that address both (SSRIs work for both; CBT can be adapted for both).

Intrusive thoughts about infant harm are common and not dangerous: Up to 50% of new mothers experience unwanted thoughts about harm coming to their baby. When these are ego-dystonic (distressing, unwanted, recognized as irrational), they represent anxiety or OCD, not psychosis, and do not indicate risk of acting on the thoughts.

Postpartum psychosis is a psychiatric emergency: Onset is typically within the first 2 weeks, often within the first 48-72 hours. Risk of infanticide, though rare, is highest with postpartum psychosis. Immediate psychiatric evaluation and usually hospitalization are required. Do not leave mother alone with infant.

Always check thyroid function: Postpartum thyroiditis affects 5-10% of women and is commonly mistaken for postpartum depression. A single normal TSH doesn’t rule it out—the condition has biphasic course (hyperthyroid then hypothyroid), so repeat testing may be needed.

Insomnia independent of infant care is a red flag: If a mother cannot sleep even when she has the opportunity (infant sleeping, partner taking over), this suggests depression or anxiety. Severe insomnia in the early postpartum period may herald psychosis.

Sertraline is preferred if breastfeeding: It has the most data supporting minimal infant exposure through breast milk. However, most SSRIs are considered compatible with breastfeeding. The risk of untreated maternal depression often outweighs medication risks.

Ask about suicide directly: Asking about suicide does not increase risk—it provides relief and opens dialogue. Suicide is a leading cause of maternal death in the first postpartum year. Every woman with postpartum depression should be asked about suicidal thoughts.

Screen beyond the 6-week visit: Postpartum depression can onset throughout the first year. The 6-week postpartum visit catches only early cases. Consider screening at all infant well-child visits in the first year and at any maternal healthcare encounter.

Critical Pitfalls to Avoid

Dismissing symptoms as “just normal new-mom tiredness”: While fatigue and adjustment are universal, persistent depressed mood, anhedonia, excessive guilt, anxiety that interferes with functioning, and especially any suicidal thoughts are NOT normal and require intervention.

Confusing intrusive OCD thoughts with psychotic symptoms: Mothers with postpartum OCD are often terrified to disclose their intrusive thoughts because they fear they will be seen as dangerous. The key distinction is that OCD thoughts are ego-dystonic (distressing, unwanted) while psychotic symptoms are ego-syntonic (believed to be real). Mistaking OCD for psychosis can lead to unnecessary separation from infant and inappropriate treatment.

Starting antidepressant monotherapy in bipolar disorder: Postpartum depression may be the first presentation of bipolar disorder. Always assess for prior manic/hypomanic episodes and family history of bipolar disorder. Antidepressant monotherapy in bipolar disorder can trigger mania or rapid cycling.

Forgetting to check thyroid: Postpartum thyroiditis is common and treatable. Mood symptoms from thyroid dysfunction will not fully respond to psychiatric treatment. A simple TSH should be part of every postpartum mood disorder evaluation.

Inadequate dosing of SSRIs: Anxiety disorders often require higher SSRI doses than depression. OCD typically requires the high end of the dosing range (e.g., sertraline 150-200mg, fluoxetine 60-80mg). Many patients are undertreated because doses are not adequately increased.

Not involving partners and family: Postpartum mood disorders affect the whole family. Partners often notice symptoms the mother minimizes. Partners themselves are at increased risk for depression. Involving family in psychoeducation and support improves outcomes.

Stopping medication too early: Relapse risk is high in the first 6 months after remission. Guidelines recommend continuing antidepressants for 6-12 months after achieving remission. Stopping early because the patient “feels better” often leads to relapse.

Ignoring postpartum PTSD: Traumatic birth experiences are common, and postpartum PTSD affects 3-15% of women. It is often overshadowed by focus on depression. Ask about the birth experience, especially if the mother avoids discussing it, has flashbacks, or fears future pregnancy.

Key Takeaways

Postpartum mood and anxiety disorders affect 15-20% of new mothers and are the most common complication of childbirth. Universal screening should occur at the postpartum visit and throughout the first year.
Postpartum blues (onset days 2-5, resolves by day 14) are normal; postpartum depression (persistent beyond 2 weeks with functional impairment) is not.
Depression and anxiety commonly co-occur. The most common presentation is mixed, often with irritability as a prominent feature.
Intrusive thoughts about infant harm are common (up to 50% of new mothers) and, when ego-dystonic, represent OCD rather than psychosis. These thoughts are distressing but not dangerous.
Postpartum psychosis is rare (0.1-0.2%) but is a psychiatric emergency. Key features include rapid onset, confusion, delusions, hallucinations, and severe insomnia. Immediate psychiatric evaluation and hospitalization are typically required.
Always check TSH to rule out postpartum thyroiditis, which affects 5-10% of women and mimics depression (hypothyroid phase) or anxiety (hyperthyroid phase).
Suicide is a leading cause of maternal death in the first postpartum year. Ask every woman with postpartum mood symptoms about suicidal ideation directly.
SSRIs are first-line pharmacotherapy and are compatible with breastfeeding (sertraline has the most data). The risk of untreated maternal depression usually outweighs medication risks to the infant.
Psychotherapy (CBT, interpersonal therapy) is effective for postpartum depression and anxiety, either alone for mild cases or combined with medication for moderate-severe cases.
Recurrence risk is 25-50% in subsequent pregnancies. Women with prior postpartum mood episodes should have a prevention plan before delivery, including consideration of prophylactic medication.

Quick Reference Algorithm

Systematic Approach to Postpartum Low Mood and Anxiety:

Screen: Use validated instruments (EPDS, PHQ-9, GAD-7) at postpartum visits and throughout the first year
Assess safety: Ask directly about suicidal ideation and thoughts of harming infant; distinguish intrusive OCD thoughts from psychotic symptoms
Classify by timing: Blues (days 1-14, self-limiting), early postpartum (2 weeks to 3 months, peak onset for depression), late postpartum (3-12 months, persistent or late-onset)
Rule out organic causes: TSH and CBC for all; more extensive workup if psychosis, atypical features, or specific suspicions (Sheehan syndrome, cerebral venous thrombosis)
Assess severity and determine level of care: Mild (supportive care, therapy), moderate (therapy and/or medication, outpatient), severe (medication plus therapy, consider intensive outpatient), psychosis (hospitalization)
Initiate treatment: SSRIs first-line for depression and anxiety (sertraline if breastfeeding); psychotherapy (CBT, IPT); address sleep and support
Follow up closely: 2 weeks initially to assess response and safety; continue treatment 6-12 months after remission
Plan for future pregnancies: Discuss recurrence risk and prevention strategies including possible prophylactic medication