Tension-type headache most common
Incidence of migraines increases<unk>  due to estrogen withdrawal
Avoid ergotamines in breast-feeding patients
Avoid ergotamines in breast-feeding patients
Findings:
Bilateral, throbbing headache
Blurred vision/scintillating scotomata
Hypertension
Epigastric/RUQ pain
Edema
↑ DTRs
Proteinuria
Bilateral, throbbing headache
Blurred vision/scintillating scotomata
Hypertension
Epigastric/RUQ pain
Edema
↑ DTRs
Proteinuria
CSF: Normal
↑ risk due to combination of vasodilatation from hyperestrogenic state and vasalvic pressure from labor
Require CT → LP if CT negative for SAH
If above negative, consider CVT vs. RCVS vs. cervicocranial arterial dissection
Further work-up includes MRI vascular studies, MRI with diffusion-weighted imaging
If above negative, consider CVT vs. RCVS vs. cervicocranial arterial dissection
Further work-up includes MRI vascular studies, MRI with diffusion-weighted imaging
Due to ↓ intracranial pressure secondary to CSF leak
Incidence: 0.5-1.5% of women receiving epidural anesthesia
Can occur in women who have not received epidural secondary to dural tears during labor
Findings
Begin 1-7 day<unk> 
Nuchal/occipital
Worsen upon standing/resolve with 10-15 mins of recumbency
+/- tinnitus, diplopia, hypoacusia
Can occur in women who have not received epidural secondary to dural tears during labor
Begin 1-7 day<unk> 
Nuchal/occipital
Worsen upon standing/resolve with 10-15 mins of recumbency
+/- tinnitus, diplopia, hypoacusia
Onset over hours
Findings
Early seizures
Stupor
Visual loss/hallucinations
Dull/throbbing headache (not thunderclap)
Symptoms resolve within days-weeks if BP controlled
CSF: normal, +/- ↑ protein
Imaging
CT: findings in ~50% of patients
MRI: Prominent T2-weighted and FLAIR, often in parieto-occipital lobes
Intracerebral hemorrhage in 15% of patients
Early seizures
Stupor
Visual loss/hallucinations
Dull/throbbing headache (not thunderclap)
CT: findings in ~50% of patients
MRI: Prominent T2-weighted and FLAIR, often in parieto-occipital lobes
Intracerebral hemorrhage in 15% of patients
Abrupt onset
Findings
"Thunderclap" headache
Multiple episodes
+/- seizures
Transient focal deficits
Typical Course
First week: headaches
Second week: intracerebral hemorrhage
Third week: Ischemic complications
CSF: 50% of patients with mild pleocytosis and protein ↑
CT: normal
CT angio/MRI
String-of-beads constriction pattern of cerebral arteries
Digital subtraction angiogram more sensitive
+/- cervical arterial dissection
Initial arteriogram may be negative
"Thunderclap" headache
Multiple episodes
+/- seizures
Transient focal deficits
First week: headaches
Second week: intracerebral hemorrhage
Third week: Ischemic complications
String-of-beads constriction pattern of cerebral arteries
Digital subtraction angiogram more sensitive
+/- cervical arterial dissection
Initial arteriogram may be negative
75% of cases are<unk> 
Findings
Progressive, diffuse; rarely thunderclap
Dizziness
Nausea
Papilledema
Lethargy
Seizures in 40%
CSF
↑ opening pressure in 80%
↑ protein/cell counts in 35-50%
CT: Often negative
MRV (preferred): Intraluminal clot flow voids
Progressive, diffuse; rarely thunderclap
Dizziness
Nausea
Papilledema
Lethargy
Seizures in 40%
↑ opening pressure in 80%
↑ protein/cell counts in 35-50%
Postpartum headache
Primary
Tension headache
Tension-type headache 
Post-lumbar puncture headache
Migraine headache 
Migraine headache
Cluster headache