Postpartum headache is one of the most common neurologic complaints after childbirth. Nearly 40% of postpartum patients develop headaches in the early puerperium. While many are benign primary headaches, such as migraine or tension-type headache, a substantial proportion are secondary headaches caused by potentially life-threatening conditions.

A new review published in Current Opinion in Anesthesiology highlights the importance of recognizing uncommon but dangerous postpartum headache syndromes that may mimic postdural puncture headache (PDPH) or preeclampsia.

These rare conditions include:

• Cerebral venous sinus thrombosis (CVST)
• Posterior reversible encephalopathy syndrome (PRES)
• Reversible cerebral vasoconstrictive syndrome (RCVS)
• Pituitary apoplexy
• Subdural hematoma
• Subarachnoid hemorrhage
• Intracranial tumors
• Lymphocytic hypophysitis

The review emphasizes that delayed diagnosis remains common because postpartum fatigue, hormonal fluctuations, sleep deprivation, and stress can obscure warning signs.

Cerebral venous sinus thrombosis (CVST)

What is CVST?

CVST is a form of stroke caused by thrombosis within the cerebral venous sinuses. The obstruction impairs venous drainage from the brain, increasing intracranial venous pressure.

Pregnancy and the puerperium significantly increase risk because of the prothrombotic state associated with childbirth. Approximately 20% of CVST cases occur during pregnancy or postpartum.

Symptoms

Patients may develop:

• Severe headache
• Focal neurologic deficits
• Seizures
• Altered mental status
• Visual symptoms

An important distinguishing feature is positional behavior opposite to PDPH:

• CVST headache often worsens while supine
• PDPH typically worsens upright

Diagnosis

Preferred imaging includes:

1. Magnetic resonance venography (MRV)
2. CT venography in selected cases

Treatment

Management usually involves:

• Systemic anticoagulation
• Neurologic monitoring
• Occasionally, thrombectomy or thrombolysis

Early recognition substantially improves outcomes.

Posterior reversible encephalopathy syndrome (PRES)

Understanding PRES

PRES is characterized by vasogenic cerebral edema, particularly affecting posterior brain regions.

The condition is strongly linked to:

• Severe hypertension
• Preeclampsia
• Eclampsia
• HELLP syndrome

Studies suggest nearly all patients with eclamptic seizures demonstrate radiographic evidence of PRES.

Clinical features

Common manifestations include:

• Headache
• Visual disturbances
• Seizures
• Weakness
• Nausea
• Altered consciousness

Imaging findings

MRI typically demonstrates:

• Parietal edema
• Occipital edema

Treatment

Management focuses on:

1. Blood pressure control
2. Magnesium sulfate therapy
3. Seizure prevention
4. Treating underlying obstetric pathology

Prompt intervention usually leads to complete neurologic recovery.

Reversible cerebral vasoconstrictive syndrome (RCVS)

What makes RCVS unique?

RCVS is characterized by diffuse cerebral arterial vasoconstriction and severe thunderclap headaches.

Although termed “reversible,” the syndrome may produce devastating complications, including:

• Ischemic stroke
• Intracerebral hemorrhage
• Subarachnoid hemorrhage

Typical presentation

Symptoms include:

• Sudden thunderclap headache
• Recurrent severe headaches
• Neurologic deficits
• Seizures

Diagnostic hallmark

Cerebral angiography often reveals the classic:

“Sausages on a string” appearance

This reflects alternating arterial constriction and dilation.

Therapy

Common treatment strategies include:

• Calcium channel blockers
• Magnesium
• Supportive care
• Blood pressure management

Pituitary apoplexy

A rare endocrine emergency

Pituitary apoplexy involves sudden hemorrhage or infarction of the pituitary gland.

Although uncommon, it may initially resemble PDPH.

Symptoms

Clinical findings may include:

• Thunderclap headache
• Diplopia
• Bradycardia
• Visual changes
• Ophthalmoplegia
• Hypopituitarism

Why are postpartum patients vulnerable?

The enlarged pituitary gland during pregnancy is more susceptible to ischemia and hemorrhage.

Severe postpartum hemorrhage can precipitate:

• Sheehan syndrome
• Pituitary necrosis

Management

Treatment may require:

1. High-dose corticosteroids
2. Neurosurgical decompression
3. Hormone replacement therapy

Postpartum subdural hematoma

How does it occur?

Subdural hematoma after delivery is most commonly associated with:

• Neuraxial anesthesia
• Dural puncture
• Intracranial hypotension

CSF leakage causes traction on fragile bridging veins, leading to hemorrhage.

Important warning sign

Initially, symptoms mimic PDPH.

However, the headache later becomes:

• Persistent
• Nonpostural
• Progressive

Risk factors

Risk factors include:

• Multiple dural punctures
• Coagulopathy
• Anticoagulation
• Preeclampsia
• HELLP syndrome

Diagnostic imaging

Urgent noncontrast CT is the preferred initial test.

Treatment

Management depends on severity:

• Conservative monitoring
• Neurosurgical evacuation
• Intensive neurologic care

Postpartum subarachnoid hemorrhage

A neurologic catastrophe

Postpartum subarachnoid hemorrhage (pSAH) is rare but highly dangerous.

Most cases result from ruptured intracranial aneurysms.

Clinical presentation

Patients often develop:

• Sudden thunderclap headache
• Vomiting
• Neck stiffness
• Altered mental status
• Focal deficits

Diagnostic approach

Recommended evaluation includes:

1. Emergent noncontrast head CT
2. Lumbar puncture if CT is negative
3. MRI or angiography when needed

Why diagnosis may be delayed

The review notes that pSAH may initially be mistaken for:

• PDPH
• Migraine
• Hypertensive headache

Intracranial tumors in the postpartum period

Pregnancy can unmask tumors

Hormonal and hemodynamic changes during pregnancy may accelerate tumor growth or edema.

Tumors most commonly identified include:

• Meningiomas
• Prolactinomas

Symptoms

Tumor-associated headaches are often:

• Progressive
• Focal
• Worse in the morning
• Associated with nausea or visual symptoms

Why is diagnosis challenging?

Symptoms overlap extensively with common postpartum complaints:

• Fatigue
• Dizziness
• Nausea
• Sleep deprivation

As a result, diagnosis may be delayed for weeks.

Lymphocytic hypophysitis

Autoimmune inflammation of the pituitary

Lymphocytic hypophysitis is an autoimmune inflammatory disorder affecting the pituitary gland.

Remarkably, 80% of cases occur during late pregnancy or postpartum.

Symptoms

Patients may experience:

• Severe headache
• Visual changes
• Fatigue
• Hypoglycemia
• Hypothermia
• Pituitary hormone deficiencies

Associated autoimmune disease

Many affected patients also have:

• Graves disease
• Addison disease
• Other autoimmune conditions

Treatment

Management may include:

1. Hormone replacement
2. Corticosteroids
3. Immunosuppressive therapy
4. Surgical decompression in severe cases

Red flags clinicians should never ignore

The review strongly emphasizes the identification of “red flag” features that mandate urgent imaging and neurologic evaluation.

Dangerous warning signs

These include:

• Thunderclap headache
• Sudden severe onset
• Focal neurologic deficits
• Altered consciousness
• Fever
• Hypertension
• Seizures
• Persistent nonpostural headache
• Visual changes
• Laboratory abnormalities

Any postpartum patient with these findings requires immediate evaluation.

Key clinical takeaway

The postpartum period creates a uniquely vulnerable neurologic state. Although many headaches are benign, clinicians must remain vigilant for dangerous secondary causes that can rapidly progress to stroke, hemorrhage, permanent neurologic injury, or death.

The authors conclude that a structured diagnostic strategy combining careful history-taking, neurologic examination, and targeted imaging is essential for reducing maternal morbidity and mortality.

Reference: Bavaro JB et al. Beyond postdural puncture headache: headache and the puerperium. Curr Opin Anaesthesiol. 2026;39:217-223. 

Read more about postpartum headache and postdural puncture headache in NYSORA’s Anesthesiology Manual. The essential guide to evidence-based clinical practice, perioperative medicine, and practical case management in anesthesiology.