A woman came to see me nine days after delivering her second child, holding her infant in one arm and pressing the other hand against her temple. She’d been told twice already — once by her OB’s office over the phone, once by an urgent care doctor — that it was “just postpartum headaches, from the hormones and the sleep deprivation.” She wasn’t so sure, because this headache got worse every time she sat up to nurse, and eased when she lay flat. That single detail changed the visit. It wasn’t hormones. It was a spinal fluid leak from her epidural, and it needed a specific fix, not more ibuprofen.
Postpartum headache is common — studies put the rate at roughly one in three women in the first six weeks after delivery — and the overwhelming majority of these headaches are benign. But the postpartum period is also one of the few times in a woman’s life when a headache can be the first sign of something dangerous: preeclampsia that didn’t resolve at delivery, a blood clot in the brain’s venous system, or a leak from spinal or epidural anesthesia. The job isn’t to be alarmed by every headache after childbirth. It’s to know which features change the calculation.
Why the postpartum weeks are genuinely different
Three things happen in the days after delivery that don’t happen at any other time. First, estrogen falls by more than 90% within 72 hours — a drop far steeper than anything in a normal menstrual cycle — and in women with migraine, that fall is a well-documented trigger, similar to what I cover in hormonal migraine more broadly. Second, blood volume, blood pressure, and coagulation are all in flux; pregnancy is a hypercoagulable state, and that clotting tendency persists for weeks after delivery, which raises the risk of cerebral venous thrombosis — a blood clot in the veins that drain the brain. Third, a large fraction of deliveries now involve spinal or epidural anesthesia, and a small percentage of those punctures leak spinal fluid, dropping intracranial pressure and producing a headache with a very specific pattern: worse upright, better lying down, the same mechanism I describe in headaches that appear only when standing.
None of this means every postpartum headache needs a workup. It means the differential is wider than “tired new mom” for the first six weeks, and I’ve had patients — and colleagues sending me patients — who were reassured for days before someone finally checked a blood pressure or ordered imaging.
The headaches that usually are exactly what they look like
Most of what I see in postpartum patients is recognizable and manageable. A primary migraine returning within the first week, often worse than usual, driven by the estrogen crash — this is the single most common cause, especially in women with a pre-pregnancy migraine history, and it frequently improves over two to four weeks as hormones stabilize. A dull, band-like tension-type headache from sleep fragmentation, dehydration, missed meals, and the simple physical strain of new caregiving is also extremely common and responds to the basics: fluids, regular meals, and sleep whenever it’s available, which is easier said than done with a newborn. Caffeine withdrawal, if intake dropped sharply after delivery, can also produce a headache in the first few days that resolves with modest caffeine or simply passes on its own.
What distinguishes these from the concerning group is that they don’t come with a clear positional pattern, a new neurological symptom, or an abnormal blood pressure — and they don’t keep escalating.
The five patterns that change everything
First: a headache that is worse sitting or standing and clearly better lying flat, especially within the first week or two after epidural or spinal anesthesia. This is the postural pattern of a post-dural puncture headache, and it’s treated differently from an ordinary headache — often with caffeine, hydration, and, if it doesn’t resolve, an epidural blood patch, a targeted procedure that seals the leak.
Second: high blood pressure, visual changes (blurring, spots, flashing lights), swelling, or upper-abdominal pain accompanying the headache — at any point up to six weeks postpartum, not just before delivery. Postpartum preeclampsia and eclampsia can appear for the first time after a woman has already gone home, and a headache is often the presenting symptom. This is a same-day blood pressure check and evaluation, not a wait-and-see.
Third: a headache that is thunderclap in onset — reaching maximum intensity within a minute or two — which is always an emergency regardless of when it happens, covered in more detail in my guide to thunderclap headache. In the postpartum period specifically, this raises concern for reversible cerebral vasoconstriction syndrome or a bleed, on top of the usual causes.
Fourth: a headache that is progressively worsening over days, doesn’t respond to usual measures, and comes with any focal neurological symptom — weakness, numbness on one side, difficulty speaking, a seizure, or vision loss. This combination, especially in the first four postpartum weeks, is the classic presentation of cerebral venous thrombosis, and it needs urgent imaging, specifically an MR or CT venogram, not a standard MRI alone.
Fifth: fever, neck stiffness, or confusion alongside the headache, which raises concern for infection, particularly after a spinal or epidural procedure. This combination needs same-day evaluation.
Any one of these five is a reason to be seen the same day, not at the next scheduled postpartum visit. You can compare against the general list in my headache red flags guide, but the postpartum window adds preeclampsia, venous thrombosis, and post-dural puncture headache as specific possibilities that a general red-flag list doesn’t fully capture.
What I actually check in the visit
Every postpartum headache visit starts with a blood pressure reading — it takes thirty seconds and rules out or confirms preeclampsia immediately. Then I ask three questions before anything else: does position change it, is there any new neurological symptom, and how many weeks out from delivery is she. Those three answers sort most patients into “reassurance and follow-up” versus “needs same-day imaging or lab work.” If there’s a postural component after neuraxial anesthesia, I loop in anesthesiology early because a blood patch, when needed, works far better than more time and more Tylenol. If there’s any focal deficit or a progressively worsening course, I order an MR venogram before a plain MRI, because a routine scan can miss a venous clot that a venogram catches directly. This mirrors the broader point I make in my piece on what a normal scan actually rules out — the right test has to match the suspected diagnosis, or a “normal” result means nothing.
If you’re weeks or months past delivery and still fighting a headache that never fully resolved, that’s a different problem — often a migraine pattern that never re-stabilized — and I’d point you to my broader piece on why a headache isn’t getting better, which walks through how we reassess when the initial explanation stops fitting. And if you had migraine before pregnancy and are now deciding what’s safe while breastfeeding, that’s worth a separate conversation, touched on in my guide to headache treatment in pregnancy.
New motherhood already comes with more than enough to monitor. You shouldn’t have to personally diagnose which headache is the dangerous one — but you should know the five patterns above well enough to act on them without hesitating, because in this window, waiting to see if it gets better is sometimes the one thing you can’t afford to do.
Not sure if your symptoms need urgent attention? Download my free Headache Red Flags Checklist to see exactly which symptoms mean “call today” versus “call soon.”
If your postpartum headache hasn’t resolved or something about it doesn’t feel right, you can talk to a specialist directly.
This article is for educational purposes and does not replace an evaluation by your own physician. If you’re experiencing a sudden, severe headache, vision changes, weakness, confusion, seizure, or a headache with high blood pressure, seek emergency care immediately.
From the textbook. Chapter 54, “Headache in Pregnancy and the Puerperium,” of my clinical textbook Headache Medicine covers this topic in full for doctors, with the evidence and decision pathways behind it. About the book →