GERD does not typically trigger epileptic seizures on its own, but it can produce episodes that look strikingly like seizures and, through several indirect routes, can genuinely lower the threshold for real ones. The overlap between acid reflux and seizure-like events is more common than most people realize, particularly in children. The connections involve the vagus nerve, metabolic disruption from chronic vomiting, side effects of reflux medications, and a condition called Sandifer syndrome that is frequently mistaken for epilepsy.
How Acid Reflux Signals Reach the Brain
The esophagus and the brain are in constant communication through the vagus nerve, the longest cranial nerve in the body. When stomach acid splashes into the esophagus, nerve endings in the esophageal lining pick up that chemical irritation and relay it upward. Those signals travel to an area in the brainstem called the nucleus of the solitary tract, then continue through relay stations in the pons and thalamus before arriving at regions of the brain involved in seizure generation, including the insular cortex and the basal forebrain.1PubMed Central. Causal relationship between gastroesophageal reflux disease, Barrett’s esophagus, and epilepsy: A bidirectional Mendelian randomization study In other words, there is a physical wiring diagram connecting your reflux to brain areas that can misfire.
Neuroimaging research supports this idea. When researchers used functional MRI to watch the brain while infusing acid into the esophagus, they found that people with GERD showed broader and more intense brain activation than healthy volunteers, especially in the insula and the prefrontal cortex.2European Journal of Radiology. Brain processing of visceral sensation upon esophageal chemical stimulation in different types of GERD The brain regions that light up in response to reflux overlap with areas associated with seizure activity. This does not mean acid reflux routinely causes seizures in the average person with heartburn, but it does suggest a plausible mechanism for why reflux and neurological symptoms sometimes travel together.
Sandifer Syndrome and Its Seizure Mimicry
The most well-documented way GERD produces seizure-like episodes is through Sandifer syndrome, a movement disorder linked to acid reflux. Sandifer syndrome causes sudden, involuntary movements of the head, neck, trunk, and upper limbs that can look remarkably like a seizure. The episodes tend to occur around feeding or shortly after meals, particularly in infants and young children. The movements are thought to be a reflexive response to esophageal discomfort: the body contorts itself into positions that temporarily relieve reflux pain.
What makes Sandifer syndrome treacherous from a diagnostic standpoint is how convincingly it mimics epilepsy. A literature review covering decades of published cases found that presenting symptoms can include abnormal movements and positioning, seizure-like episodes, eye-rolling, irritability, and even developmental delay.3PubMed Central. Diagnosis and management of Sandifer syndrome in children with intractable neurological symptoms These episodes can be dramatic enough that children are placed on antiepileptic medications for months or years before anyone considers a gastrointestinal cause. The condition is considered rare but is likely underdiagnosed precisely because of how easily it is confused with epilepsy.4PubMed. A female adult with Sandifer’s syndrome and hiatal hernia misdiagnosed as epilepsy with focal seizures
Although Sandifer syndrome is most commonly associated with children, it is not exclusively pediatric. At least one published case describes an adult woman with a hiatal hernia whose Sandifer syndrome was misdiagnosed as focal epilepsy.4PubMed. A female adult with Sandifer’s syndrome and hiatal hernia misdiagnosed as epilepsy with focal seizures The key diagnostic clue is that the episodes resolve when reflux is treated effectively. If antiepileptic drugs are not controlling the “seizures” but a proton pump inhibitor does, Sandifer syndrome should be on the table.
Children With Neurological Conditions Face a Double Bind
The picture gets more complicated in children who already have neurological conditions like cerebral palsy. GERD is far more common in these children than in the general pediatric population, and they also have a higher baseline risk for epilepsy. When a child with cerebral palsy has an episode that looks like a seizure, it can be genuinely difficult to tell whether it is an epileptic event, a reflux-triggered episode like Sandifer syndrome, or both happening at the same time.
A study that examined children originally diagnosed with epilepsy found that nearly a third of those studied actually had GERD alone that had been misdiagnosed as seizures. Another roughly equal-sized group had genuine epilepsy alongside GERD, and a third group had epilepsy, GERD, and cerebral palsy all coexisting.5PubMed. Misdiagnosis of gastroesophageal reflux disease as epileptic seizures in children The practical consequence is that some children end up on unnecessary antiepileptic drugs while their reflux goes untreated, and others with genuine epilepsy have their reflux overlooked as a contributor to symptom severity.
Cough Syncope With Convulsions in Adults
GERD can also generate seizure-like events through a completely different route: cough syncope. Chronic acid reflux irritates the throat and larynx, causing a persistent cough. In susceptible people, violent coughing fits trigger an exaggerated vagal reflex that slows the heart sharply. The resulting drop in blood flow to the brain can cause loss of consciousness and convulsive movements that look indistinguishable from a seizure to a bystander.
One reported case involved a middle-aged man admitted for evaluation of syncope and convulsions. His heart rhythm was normal at baseline, but after repeated bouts of coughing, his heart rate dropped dramatically and he convulsed. The root cause turned out to be GERD-induced inflammation of his throat. Once he was started on a proton pump inhibitor, the syncope and convulsions stopped entirely.6PubMed. Cough syncope induced by gastroesophageal reflux disease This chain of events, where reflux causes throat irritation, which causes coughing, which causes a vagal reflex, which causes convulsions, shows how far removed the visible symptom can be from the underlying cause.
When GERD Indirectly Causes Genuine Seizures
Beyond producing events that merely mimic seizures, GERD can, in certain circumstances, actually cause real epileptic seizures. The mechanism is not the reflux itself but the metabolic consequences of severe or complicated reflux disease.
Chronic, forceful vomiting associated with severe GERD or structural problems like a hiatal hernia can deplete the body of chloride, potassium, and water. This creates a state of metabolic alkalosis: the blood becomes too alkaline, electrolytes drop to dangerous levels, and the brain becomes more excitable. One published case described a man with an “upside-down stomach” (a large hiatal hernia that had rotated) who arrived at the hospital in the midst of epileptic seizures. His blood pH was severely alkaline, his potassium was dangerously low, and he was profoundly dehydrated. Once intravenous fluids corrected his electrolyte imbalances, the seizures stopped, and he went on to have surgical repair of the hernia.7Case Reports in Gastroenterology. Metabolic Alkalosis, Acute Renal Failure and Epileptic Seizures as Unusual Manifestations of an Upside-Down Stomach This is an uncommon scenario, but it illustrates that severe GERD complications can create the chemical conditions the brain needs to seize.
Proton Pump Inhibitors and Magnesium Depletion
There is an ironic twist to the GERD-seizure story: one of the most common treatments for reflux can itself trigger seizures. Proton pump inhibitors like omeprazole, lansoprazole, and esomeprazole are the backbone of GERD therapy, and they are generally safe. But long-term use, typically over a year, can impair the gut’s ability to absorb magnesium. The resulting magnesium deficiency, called hypomagnesemia, can cause muscle spasms, cardiac arrhythmias, and seizures.
A case report described a 78-year-old man with a history of recurring tonic-clonic seizures who presented to the emergency department after another episode. His magnesium level was severely low. After other causes were ruled out, chronic PPI use was identified as the most likely culprit.8Medical & Clinical Research. A Rare Case of Seizures Secondary to Proton Pump Inhibitors-Induced Hypomagnesemia The connection is important because millions of people take PPIs daily, and magnesium levels are not routinely monitored. If you have been on a PPI for a long time and develop neurological symptoms like twitching, confusion, or seizure-like events, a magnesium check is a reasonable step.
This does not mean PPIs are dangerous or that you should stop taking one without talking to your doctor. The complication is uncommon. But it is an underappreciated contributor to seizures in people who may already have risk factors, and it is entirely reversible with magnesium supplementation and, when possible, switching to a different class of acid-suppressing medication.
GERD and Psychogenic Non-Epileptic Seizures
There is another, less intuitive connection between GERD and seizure-like events. People with GERD appear to be at increased risk for psychogenic non-epileptic seizures, or PNES. These are episodes that look like seizures but are not caused by abnormal electrical activity in the brain. Instead, they are thought to arise from the nervous system’s response to stress, pain, or other chronic physical inputs.
A study examining predictors of PNES found that GERD was a significant biological predictor. People with GERD had roughly 70 percent higher odds of being diagnosed with PNES alone, and more than double the odds of having PNES alongside epilepsy, compared to people without GERD.9PubMed. Biopsychosocial predictors of psychogenic non-epileptic seizures A separate study confirmed GERD’s presence among the comorbidities that distinguish PNES patients from those with epilepsy alone.10PubMed. Identification of risk factors and distinguishing psychogenic nonepileptic seizures from epilepsy: A retrospective case-control study
Why would chronic reflux be linked to non-epileptic seizures? The relationship is not fully understood, but several theories are plausible. Chronic pain and visceral discomfort from GERD may sensitize the autonomic nervous system in ways that predispose it to these events. The vagal signaling between the gut and brain described earlier could play a role. It is also possible that the overlap reflects shared risk factors like chronic stress and anxiety, which both worsen GERD and increase susceptibility to PNES. Whatever the mechanism, the clinical implication is clear: when someone with GERD has seizure-like events that do not respond to antiepileptic drugs, PNES should be on the list of possible explanations.
The Reverse Confusion: Epilepsy Mimicking a Stomach Problem
The diagnostic confusion runs in both directions. Just as GERD can be mistaken for epilepsy, certain types of epilepsy can be mistaken for gastrointestinal disease. About two and a half percent of patients with epilepsy are initially misdiagnosed with a GI disorder, with the error being especially common in children under one year of age.11PubMed Central. Epilepsy and the gut: Perpetrator or victim?
The classic example is abdominal epilepsy, a form of temporal lobe epilepsy in which seizures produce intense abdominal pain, nausea, or a “rising” sensation in the stomach rather than the convulsive movements people associate with seizures. These events can be accompanied by pallor, sweating, and autonomic changes that look for all the world like a GI flare. Since temporal lobe seizures often begin with an epigastric aura, a feeling that rises from the stomach toward the chest or throat, the overlap with reflux symptoms can be uncanny. A child who repeatedly clutches their stomach and appears distressed may be having seizures rather than reflux, but only an EEG during the episode would show the difference.
Infants, Apnea, and the Tangled Web
In very young infants, the relationship between reflux, breathing, and seizures becomes particularly tangled. Apparent life-threatening events in infants, episodes where the baby stops breathing, turns blue, or goes limp, are frequently attributed to GERD. And reflux is indeed common in infants. But the temporal sequence is not always what it seems.
Research monitoring infants simultaneously for reflux, apnea, and brain activity found that in some cases, a seizure actually came first and appeared to trigger both the reflux episode and the apnea that followed. The seizure was the cause, not the consequence, of the apparent reflux event.12PubMed Central. Apnea of infancy, seizures, and gastroesophageal reflux: an important but infrequent association This matters practically because treating the reflux alone will not prevent future episodes if an underlying seizure disorder is driving them. For infants with recurrent apneic events attributed to GERD, especially when reflux treatment does not resolve the episodes, investigation for a seizure disorder is warranted.
Sorting It Out Diagnostically
Given all the ways reflux and seizure-like events can overlap, getting the right diagnosis sometimes requires monitoring multiple systems at once. For children in particular, clinicians have recommended combining video EEG (to watch brain activity), polysomnography (to track breathing and sleep patterns), and simultaneous gastric pH monitoring (to detect reflux episodes) when the clinical picture is ambiguous.13PubMed Central. My child cannot breathe while sleeping: a report of three cases and review By running all three at the same time, it becomes possible to see whether a suspicious episode correlates with acid reflux, abnormal brain activity, a breathing disturbance, or some combination.
In practice, a few patterns can help point clinicians in the right direction:
- Timing relative to meals: Episodes that cluster around feeding or occur when lying down after eating lean toward a reflux-related cause.
- Response to reflux treatment: If a proton pump inhibitor or postural changes resolve the episodes, the cause was almost certainly GI, not neurological.
- EEG findings: A normal EEG during an episode strongly argues against epilepsy. An abnormal EEG during what appeared to be a reflux event suggests the episode may actually be seizure-driven.
- Stereotyped posturing: The distinctive neck extension and torso arching of Sandifer syndrome, once recognized, is fairly characteristic and different from the rhythmic jerking of a tonic-clonic seizure.
None of these clues is definitive on its own. The children and adults who are hardest to diagnose are those who have both GERD and a neurological condition, since both can contribute to symptoms simultaneously. In those cases, the multi-system monitoring approach becomes especially valuable.
When the Episodes Are Not Epilepsy and Not Reflux
One underappreciated possibility is that seizure-like events in someone with GERD are neither epileptic seizures nor a direct mechanical consequence of reflux, but PNES. As mentioned earlier, GERD is a biological predictor for these episodes, and the distinction matters because PNES does not respond to antiepileptic drugs. People with unrecognized PNES often cycle through escalating doses of seizure medications without improvement, accumulating side effects along the way. If GERD is present and antiepileptic therapy is not working, a video EEG during a captured event is the gold standard for distinguishing PNES from epilepsy. The EEG will appear normal during a PNES episode, whereas it will show characteristic discharges during an epileptic seizure.
Treatment for PNES is fundamentally different from treatment for epilepsy. It centers on psychological approaches such as cognitive behavioral therapy, and addressing physical contributors to nervous system sensitization, including undertreated GERD, chronic pain, and sleep disruption. Recognizing the GERD-PNES connection can prevent years of inappropriate treatment and the frustration that comes with a label of “drug-resistant epilepsy” when the underlying problem was never epileptic in the first place.
Practical Guidance for People Living With Both
If you have GERD and are experiencing episodes that resemble seizures, whether that means sudden involuntary movements, loss of consciousness, convulsions, or unusual sensations that come and go abruptly, the most important step is to seek evaluation rather than assuming reflux is or is not the cause. A few things are worth keeping in mind as you navigate the process:
Filming an episode on your phone, if you are able to do so safely, gives your doctor more diagnostic information than any description after the fact. The posture, duration, eye movements, and recovery pattern all carry clues that distinguish between a Sandifer episode, a syncopal convulsion, a PNES event, and a true seizure. If you are on long-term PPI therapy and have new neurological symptoms, ask about checking your magnesium and other electrolyte levels. If you have a child who has been diagnosed with epilepsy but whose events are not controlled by medication, raising the possibility of Sandifer syndrome or reflux-related episodes with the treating neurologist is a reasonable and evidence-supported step. The resolution of some of these cases is remarkably straightforward once the right diagnosis is made: treat the reflux, and the “seizures” stop.