A woman came to see me five days after delivering her first baby. She could feed him lying on her side without much trouble. The moment she sat upright to burp him, a vise closed on the back of her head and neck, and within a minute she had to lie flat again. Her obstetric team had told her it was exhaustion and dehydration and to drink more water. She had been drinking water for five days, and she had stopped trying to sit up at all.
She did not have a dehydration headache. She had a post-dural puncture headache from her epidural, and the fix for it takes about twenty minutes. Here is the answer up front: a headache that appears within a few days of an epidural, spinal anesthetic, or lumbar puncture, that is clearly worse upright and clearly better lying flat, is a low cerebrospinal-fluid-pressure headache until proven otherwise. Fluids, bed rest, and caffeine are not the treatment — they are what we do while deciding whether to do the treatment, which is an epidural blood patch.
Why the pain only arrives when you sit up
Your brain is not resting on the floor of your skull. It is floating in roughly 150 millilitres of cerebrospinal fluid, buoyed so that its effective weight drops from about 1,400 grams to something closer to 50. A needle passed through the dura leaves a small hole, and if that hole does not seal, fluid leaks out into the epidural space faster than it is replaced.
Lying down, the pressure difference is small and you feel almost normal. Standing up, the cushion is no longer sufficient. The brain sags a few millimetres, and the pain-sensitive structures that tether it — the bridging veins, the dura at the skull base, the upper cervical nerve roots — are put under traction. That traction is the headache. It is typically at the back of the head and neck, often described as pulling or dragging rather than throbbing, and it has a characteristic tempo: worse within about fifteen minutes of getting upright, better within about fifteen minutes of lying flat.
The associated symptoms follow the same mechanism and are the ones patients rarely think to mention. Neck stiffness. Ringing in the ears or a muffled, underwater quality to hearing, because CSF pressure is transmitted to the inner ear. Light sensitivity. Nausea. Occasionally double vision, which reflects stretch on the sixth cranial nerve as it runs along the skull base — that one always earns a same-day call, because it means the sag is significant.
How I sort it out from everything else
The postural pattern does most of the diagnostic work, and it is why I ask patients to test it deliberately rather than describe it from memory: lie flat for thirty minutes, then stand for fifteen, and tell me what changed. Migraine and tension-type headache do not behave that way. They may be a little worse with movement, but they do not switch off when you lie down and switch on when you stand.
Timing matters too. Post-dural puncture headache usually begins within 24 to 48 hours of the procedure, and by definition within five days. A headache that starts three weeks later is a different problem. So is one that was there before the needle went in.
The risk is not equal across procedures. A fine, pencil-point atraumatic needle used for a diagnostic lumbar puncture leaves a hole that usually seals on its own, and the modern incidence is low. The large Tuohy needle used to place a labour epidural is not meant to enter the dura at all, but when it accidentally does — roughly one in a hundred placements — it makes a much bigger hole, and a majority of those women go on to a significant headache. Being young, female, and of low body mass index raises the odds further, which is exactly the obstetric population. If you had an epidural and someone mentioned a “wet tap,” that is what they were describing.
One more thing I check carefully in postpartum patients: blood pressure, reflexes, and whether the headache is genuinely postural. Preeclampsia and cerebral venous thrombosis both occur in the same weeks and both can be mistaken for a spinal headache — and a low-pressure state slightly raises clot risk in its own right. I have written separately about which postpartum headaches are normal and which are emergencies, and the distinction is worth reading if you are in the first six weeks after delivery.
What actually helps in the first 48 hours — and what doesn’t
Lying flat relieves the pain, and there is no reason to resist that in the acute phase. But strict bed rest does not make the hole close faster, and neither does aggressive hydration. Drinking three litres of water a day does not increase CSF production in any clinically meaningful way. This is one of the most durable myths in hospital medicine, and it is the reason my patient spent five days flat on her back believing she was doing the treatment.
What is reasonable while you wait: regular paracetamol and an anti-inflammatory, something for nausea, and caffeine, which causes modest cerebral vasoconstriction and gives many people a few hours of genuine relief. Some anesthesia teams offer a sphenopalatine ganglion block through the nostril, which is low-risk and occasionally impressive. None of these close the leak. They buy time.
Most mild post-dural puncture headaches do resolve on their own within a week as the dura seals. The mistake is assuming that applies to every case, and waiting indefinitely while someone cannot stand upright to care for a newborn.
The epidural blood patch: when I stop waiting
A blood patch means drawing 15 to 20 millilitres of your own blood from a vein and injecting it into the epidural space at the level of the puncture. It works two ways — the volume immediately raises epidural pressure and lifts the brain back into position, which is why relief is often felt within minutes, and the clot then forms a patch over the dural hole while it heals.
First attempts give substantial relief in the large majority of patients, though success is lower after a large-bore obstetric wet tap, and perhaps one in three of those will need a second patch. A second patch is not a failure; it is a common part of the course.
I stop waiting and refer for a patch when the headache is severe enough to prevent normal function — and caring for an infant counts — when it has not improved meaningfully after 24 to 48 hours of conservative measures, or immediately if there are cranial nerve symptoms such as double vision or significant hearing change. The procedure is not risk-free: back pain afterwards is common and usually brief, and there is a small chance of a fresh dural puncture. Those risks are modest against days or weeks of being unable to lift your head.
When a positional headache is no longer routine
Two changes make me act urgently. The first is a headache that loses its postural character — it was clearly worse upright, and now it hurts constantly, or the pattern reverses. That can mean the leak has caused a subdural collection or a venous sinus thrombosis, both of which need imaging rather than another patch. The second is any new neurological sign: fever, seizure, confusion, weakness, or a headache that explodes to maximum intensity in under a minute, which is a thunderclap headache and an emergency department problem regardless of what procedure you had.
It is also worth knowing that the same low-pressure syndrome happens without any needle at all, from a spontaneous tear in the dura, and those patients are misdiagnosed for years — I have described that condition in Headache Only When Standing Up? This Is Why. If your positional headache came out of nowhere with no procedure behind it, start there.
My patient had her blood patch that afternoon. She telephoned the next morning to say she had eaten breakfast sitting at a table. The five days of water had not been a treatment failure — the treatment had simply never been offered, because nobody asked her the one question that would have named the problem in thirty seconds. That is the pattern behind most stalled headache diagnoses, and I have written about why good doctors miss it in Headache Not Getting Better? What Doctors Miss.
Free download: The Headache Red Flags Checklist — the warning signs I teach patients to recognize, in one page.
Still unable to sit upright, or unsure what you were told? Talk to a specialist.
Written by Dr. Tae-Ho Guak, MD, board-certified neurologist. This article is for general education and is not a substitute for individual medical advice. It cannot account for your full history, examination, or imaging. If you developed a headache after an epidural, spinal anesthetic, or lumbar puncture, contact the anesthesia or obstetric team who performed the procedure, and seek emergency care for fever, confusion, weakness, seizure, visual loss, or any sudden severe headache.
From the textbook. Chapter 42, “Disorders of Intracranial Pressure,” of my clinical textbook Headache Medicine covers this topic in full for doctors, with the evidence and decision pathways behind it. About the book →