Is It Normal to Have a Headache After Anesthesia?

Headaches after anesthesia are genuinely common, not a fluke. One prospective study at a teaching hospital found that over half of surgical patients reported a headache within the first three postoperative days.¹ The cause varies depending on the type of anesthesia, your personal habits, and a handful of risk factors that are worth understanding before and after surgery.

Headaches After General Anesthesia

When people picture “going under,” they usually mean general anesthesia, where you are fully unconscious and breathing through a tube or mask. Headaches after this type of anesthesia are frequently overlooked by medical teams because they tend to be mild to moderate and self-limiting. But for the person dealing with post-surgical pain on top of a throbbing head, they feel anything but trivial.

Several factors converge to trigger these headaches. In that same prospective study, general anesthesia itself was independently associated with roughly double the odds of a postoperative headache compared to regional techniques.¹ Some of the reasons are mechanical: the endotracheal tube or laryngeal mask used to maintain your airway can strain muscles in the jaw and neck, and lying flat for hours with your head positioned for the surgeon’s needs puts sustained pressure on structures that can leave you sore afterward. Blood pressure drops during the procedure (intraoperative hypotension) also showed a significant association with headache in the same study. And then there is the simple fact that you have been fasting. Prolonged fasting before surgery more than doubled the odds of developing a postoperative headache, independent of other factors.¹ Being dehydrated and hungry is a reliable recipe for a headache on its own, and surgery adds stress hormones and inflammation on top of it.

The Caffeine Withdrawal Factor

If you drink coffee, tea, or energy drinks daily, your post-anesthesia headache may have less to do with the anesthetic drugs than with going cold turkey on caffeine. Surgical fasting instructions typically mean nothing by mouth from the night before, and for a regular caffeine drinker, that is long enough to trigger withdrawal. Caffeine withdrawal symptoms, headache chief among them, can begin within about eight hours of your last dose.

A study in the early 1990s found that postoperative headaches hit about 22% of patients who regularly drank caffeinated beverages, compared with only 7% of those who did not.² Among the daily drinkers, those who managed to have a caffeinated beverage on the day of their procedure had a lower headache rate than those who abstained entirely. A separate study quantified the dose-response relationship: for every additional 100 mg of daily caffeine consumption (roughly one cup of coffee), the odds of postoperative headache rose by about 16%.³ The researchers concluded that this relationship was explained, at least in part, by a perioperative withdrawal syndrome.

The practical takeaway is simple. If you are a heavy coffee drinker heading into surgery, mention it to your anesthesia team. Some clinicians will allow a small amount of clear black coffee a couple of hours before the procedure, and post-surgery, resuming caffeine promptly (a cup of coffee or a caffeinated soft drink) can help resolve the headache faster than painkillers alone.

Post-Dural Puncture Headache After Spinal or Epidural Anesthesia

When anesthesia involves a needle entering the space around your spinal cord, whether for a spinal block, an epidural (common in labor and cesarean deliveries), or a diagnostic lumbar puncture, a different and more specific type of headache can result. This is called post-dural puncture headache, and it has a very distinctive character: it gets worse when you sit or stand up and improves when you lie down.

The cause is physical. The needle punctures the dura, the tough membrane surrounding the spinal cord and cerebrospinal fluid. If the puncture site does not seal quickly, spinal fluid leaks out. With less fluid cushioning the brain, the brain sags slightly when you are upright, pulling on pain-sensitive structures including the dura itself and the blood vessels around it.⁴ That traction is what produces the headache, and it explains the positional nature. Lie down and gravity stops pulling the brain downward; the pain eases.

The overall incidence of post-dural puncture headache varies enormously, from below 1% to over 30%, depending heavily on the type and size of needle used.⁵ Older-style “cutting” needles, which slice through the dura, leave a larger hole and are associated with much higher headache rates. In one trial comparing needle types in obstetric patients, the headache rate was about 28% with a cutting-type needle versus 5% with a pencil-point needle that separates rather than cuts the dural fibers.⁶ A meta-analysis confirmed the pattern across many studies, finding that cutting needles carried about two and a half times the risk of headache compared to pencil-point designs.⁷ Modern anesthetic practice has largely shifted toward pencil-point needles for exactly this reason, though the older type is still in use in some settings.

Who Gets Hit Hardest

Not everyone is equally susceptible. Several risk factors appear consistently across studies of post-anesthesia headache, whether the anesthesia is general or spinal.

For headaches after general anesthesia, the strongest predictor in one large study was a prior history of headaches, which nearly quintupled the odds. Being female and being a regular caffeine consumer were also independently significant.¹

For post-dural puncture headache specifically, the evidence converges on a similar list: younger age, female sex, low body mass index, multiple puncture attempts, and a history of chronic headache.⁵ A prospective study of nearly 300 procedures found that all of those factors held up in multivariate analysis, along with a history of previous post-dural puncture headache and the number of puncture attempts.⁸

Pregnancy is a particularly notable risk factor, partly because pregnant women tend to be young and female (two independent risks), but also because they frequently undergo epidural or spinal anesthesia for labor and cesarean delivery. A retrospective study of women undergoing cesarean section found that repeated puncture attempts increased the risk of post-dural puncture headache about two and a half times, and having a pre-existing tension headache increased it roughly fourfold.⁹

Adolescents also seem to be at elevated risk. A study comparing age groups found that patients aged 12 to 19 had an almost threefold increase in the odds of developing post-dural puncture headache compared to adults aged 20 to 45.¹⁰ The absolute rates were relatively low (around 5% in the younger group versus under 2% in adults), but the difference is meaningful for a teenager facing a spinal procedure.

How Post-Anesthesia Headaches Are Treated

For the garden-variety headache after general anesthesia, treatment is straightforward: rehydrate, eat something, resume caffeine if you are a regular drinker, and take over-the-counter painkillers. Most of these headaches resolve within a day or two without any special intervention.

Post-dural puncture headache often responds to similar conservative measures initially. Lying flat helps because it removes the gravitational pull on the brain. Caffeine, NSAIDs, and adequate fluid intake are first-line approaches. Various medications have been tried, including dexamethasone, theophylline, sumatriptan, gabapentin, and even adrenocorticotropic hormone.¹¹ Evidence for most of these is mixed, and no single drug has emerged as a clear winner beyond caffeine and standard anti-inflammatories.

When conservative measures fail and the headache is moderate to severe, the gold-standard treatment is an epidural blood patch. This involves injecting a small amount of your own blood into the epidural space near the puncture site. The blood clots and seals the hole in the dura, stopping the spinal fluid leak.¹² One series using fluoroscopic guidance to place the patch precisely reported a 100% success rate, with the only side effect being mild temporary backache.¹³ In that series, 9 out of 15 patients with post-dural puncture headache recovered with conservative management alone, and only 6 needed the blood patch. That ratio is roughly representative: most cases resolve on their own, and the blood patch is reserved for the stubborn minority.

The blood patch works by creating a mass effect that pushes cerebrospinal fluid from the spinal compartment back up toward the brain, temporarily raising intracranial pressure and providing immediate relief. Over the following days, the clot matures into a permanent seal. The procedure takes about 20 minutes and is generally considered very safe, though it does involve another epidural needle, which can feel like an unwelcome callback if the original puncture is what caused your headache in the first place.

When to Take a Post-Anesthesia Headache Seriously

Most post-anesthesia headaches are benign nuisances. But a headache after surgery can occasionally signal something more serious, and clinicians have to distinguish between the expected and the alarming. Neurologists called to evaluate postoperative patients need to sort out whether symptoms were actually caused by the anesthetic procedure or are unrelated complications that happened to show up after surgery.¹⁴

Some red flags that should prompt you to contact your surgical or anesthesia team rather than toughing it out:

Thunderclap onset: A sudden, explosive headache that reaches peak intensity in seconds could indicate a subarachnoid hemorrhage or cortical vein thrombosis, not a simple post-anesthesia headache.
Fever with headache: This combination after a spinal or epidural procedure raises concern for meningitis, which is rare but requires immediate treatment.
Neurological changes: Vision loss, double vision, hearing changes, weakness in your limbs, or confusion alongside a headache suggest the problem goes beyond a mild fluid leak.
Headache that worsens lying down: A classic post-dural puncture headache improves when flat. If yours gets worse when you lie down, the mechanism is likely different and warrants evaluation, since raised intracranial pressure causes the opposite pattern.
Persistence beyond a week: Most post-anesthesia headaches resolve within a few days. One that lingers, especially after a spinal or epidural, may need imaging to rule out a subdural hematoma or an ongoing leak that will not seal on its own.

None of these red flags are common. The vast majority of post-anesthesia headaches are uncomfortable but temporary. But knowing what to watch for can save you from either unnecessary panic over a routine caffeine-withdrawal headache or dangerous complacency about a headache that is actually signaling trouble.

Pre-Existing Headache Disorders and Surgery

If you already live with migraines or chronic tension headaches, surgery can provoke them. A nationwide propensity-matched study examined post-surgical migraine specifically and found that pre-existing anxiety and depressive disorders each roughly doubled the odds of postoperative migraine, and being male was actually protective (about half the odds of women).¹⁵ Frequent emergency room visits before surgery, a proxy for overall health burden, also raised the risk incrementally.

This matters practically because if you have a migraine history, a post-anesthesia headache may escalate into a full migraine attack rather than remaining a dull generalized ache. Letting your anesthesia team know about your headache history beforehand is useful, since they may adjust your postoperative pain plan to include migraine-specific medications or ensure you have access to your usual rescue drugs in the recovery room. The fasting and dehydration that accompany surgery are well-known migraine triggers independent of anesthesia, so strategies that minimize those exposures (like shorter fasting windows where medically safe and early rehydration afterward) can make a meaningful difference for migraine-prone patients.

Headaches From Surgical Positioning and Airway Equipment

Some post-anesthesia headaches have nothing to do with the anesthetic chemicals or spinal fluid dynamics. They are straightforward musculoskeletal pain from spending hours in a fixed position while unconscious and unable to shift around. Under general anesthesia, you cannot adjust your head when your neck gets stiff, and the surgical team positions you for optimal access to the operative site, not for your comfort.

Certain surgeries carry higher headache risk for purely mechanical reasons. Procedures on the cervical spine, for example, can produce significant postoperative headache, especially when the surgical hardware extends up to the C2 vertebra. One study found that severe new-onset headache occurred significantly more often after posterior spinal fixation starting at C2 compared to fixation starting lower on the spine.¹⁶ The upper cervical spine has direct anatomical connections to the structures that produce headache, so operating there can trigger pain that feels like it is coming from inside the skull.

Airway management devices can also contribute. The laryngeal mask airway and endotracheal tube both require opening the mouth and sometimes manipulating the jaw. In susceptible individuals, this can strain the temporomandibular joint, leading to jaw pain that radiates into the temples and is easily mistaken for a primary headache.¹⁷ Full jaw dislocation is uncommon, but subclinical strain that produces a headache-like ache around the temples and ears is not rare, particularly in people with a history of jaw problems. If your post-anesthesia headache is concentrated around your temples and jaw rather than across the top or front of your head, this could be the culprit, and it responds better to jaw rest and moist heat than to the usual headache remedies.