Acid reflux can affect your heart rate, though the relationship is more tangled than a simple cause-and-effect. The esophagus and heart sit just millimeters apart and share a nerve highway through the vagus nerve, which means irritation in one organ can ripple into the other. Depending on the circumstances, reflux has been linked to both heart rate increases and decreases, as well as irregular rhythms like atrial fibrillation.
The Vagus Nerve and the Esophagocardiac Reflex
The vagus nerve is the main communication line between your brain and your gut, and it runs right alongside the esophagus on its way down to the stomach. When acid splashes up into the esophagus, it can stimulate nerve endings that trigger what researchers call an esophagocardiac reflex. In controlled experiments where acid was infused directly into the esophagus, heart rate actually dropped rather than sped up. This reflex appears to be driven by the vagus nerve’s parasympathetic branch, which generally acts as the body’s braking system for heart rate.1PubMed. Does physiologic gastroesophageal reflux affect heart rate or rhythm?
So if acid in the esophagus can slow the heart down, why do so many people with reflux report feeling their heart race? The answer lies in how the body responds over time versus in a single moment. The acute vagal reflex from a burst of acid is a slowing response, but chronic reflux appears to rewire the autonomic nervous system in the opposite direction, as the next section explains. There is also the simple fact that the discomfort, anxiety, and pain caused by a reflux episode can trigger an adrenaline response that speeds your heart rate through a completely separate pathway.
How Chronic Reflux Shifts Your Autonomic Balance
Your autonomic nervous system has two branches that constantly push and pull your heart rate. The parasympathetic branch (via the vagus nerve) slows it down, and the sympathetic branch speeds it up. In people with ongoing gastroesophageal reflux disease, studies measuring heart rate variability have consistently found that the balance tips toward the sympathetic side. Vagal tone drops, sympathetic activity climbs, and the net effect is a nervous system that runs hotter than normal.2PubMed Central. Roles of Heart Rate Variability in Assessing Autonomic Nervous System in Functional Gastrointestinal Disorders: A Systematic Review
This autonomic imbalance doesn’t just raise your resting heart rate by a few beats per minute. It can make your heart more reactive to triggers like stress, meals, or position changes. Some researchers have proposed that measuring heart rate variability could be a useful, noninvasive way to detect this autonomic dysfunction in people with GERD.3PubMed. Autonomic dysfunction in gastroesophageal reflux disease. The neurogastro-cardiac axis: friend or foe? In practical terms, if you have poorly controlled reflux and notice your resting pulse seems higher than it used to be, the autonomic shift associated with chronic GERD is one plausible explanation worth discussing with your doctor.
When the Stomach Physically Pushes Against the Heart
The esophagus passes through a small opening in the diaphragm on its way to the stomach. When that opening loosens, part of the stomach can slide upward into the chest cavity, forming what is called a hiatal hernia. Large hiatal hernias are one of the main drivers of chronic acid reflux, but they also create a separate, purely mechanical problem: the displaced stomach can press directly against the heart.
Because the esophagus runs right behind the left atrium, a large hiatal hernia or even a swollen, distended esophagus can compress the heart chambers. Case reports have documented this compression causing arrhythmias and even interfering with the heart’s ability to pump effectively.4Annals of Case Reports. A Large Hiatal Hernia Causing Cardiac Compression and Leading to Arrhythmias In one well-documented case, a patient developed frequent premature ventricular contractions in a repeating pattern called bigeminy. The irregular heartbeats resolved completely after the hiatal hernia was surgically repaired and did not come back on follow-up monitoring.5PubMed Central. A large hiatal hernia causing frequent premature ventricular contractions with bigeminy: A case report and review of literature
These aren’t common scenarios, but they illustrate something important: the connection between reflux and heart rate changes isn’t always about acid at all. Sometimes it is the sheer physical rearrangement of organs in the chest that causes cardiac symptoms.
Gastrocardiac Syndrome
The broader phenomenon of gastrointestinal problems triggering cardiac symptoms has a name: gastrocardiac syndrome, sometimes called Roemheld syndrome. The idea is that gastric distension, acid irritation, or diaphragmatic pressure sends signals through the vagus nerve that disrupt heart rhythm. In one published case, a patient with both a hiatal hernia and GERD developed worsening palpitations specifically triggered by eating. After cardiac workups came back clean, surgical repair of the hernia resolved her arrhythmia entirely.6PubMed Central. Rare and unusual presentation of gastrocardiac syndrome
In a more extreme example, a patient developed acute heart failure physiology triggered by gastric distension from retained foreign bodies. The heart failure reversed after the objects were removed endoscopically. The proposed mechanism involved vagal stimulation from the distended stomach along with impaired blood return to the heart from the physical mass effect.7PubMed Central. Acute heart failure physiology reversed by endoscopic removal of retained toothbrushes in gastro-cardiac (Roemheld) syndrome: a case report
Gastrocardiac syndrome is underdiagnosed in part because most physicians are trained to think of the heart and gut as separate systems. If you consistently notice heart pounding or skipped beats during or after meals, especially if cardiac testing has been unremarkable, it is worth raising the possibility with your doctor. The fix, in some cases, turns out to be treating the digestive problem rather than the heart.
The Link Between Reflux and Atrial Fibrillation
Atrial fibrillation is the most studied arrhythmia in connection with GERD. It is a condition where the upper chambers of the heart quiver chaotically instead of contracting in an organized rhythm, often causing a noticeably fast and irregular pulse. A genetic-analysis study designed to test whether the relationship is causal found that GERD increased the risk of atrial fibrillation by roughly a third.8International Journal of Medical Sciences. Gastroesophageal reflux disease and atrial fibrillation: a bidirectional Mendelian randomization study
Population data from a large Taiwanese cohort found a similar relationship, with GERD independently associated with a higher risk of developing atrial fibrillation within three years. But it isn’t entirely straightforward. A study from Olmsted County in the United States found that simple acid reflux by itself did not significantly raise atrial fibrillation risk after adjusting for other factors. The risk jumped only in people who had visible inflammation of the esophagus, called esophagitis, where the hazard roughly doubled.9EP Europace. Atrial fibrillation and gastroesophageal reflux disease: the cardiogastric interaction This suggests that it may not be casual heartburn driving the arrhythmia risk, but rather the chronic inflammation that comes with more severe, tissue-damaging reflux.
An intriguing clinical observation reinforces the connection: some patients with both GERD and atrial fibrillation have seen their arrhythmia symptoms improve when treated with proton pump inhibitors, the standard acid-suppressing medication for reflux.10PubMed Central. Gastroesophageal Reflux and Its Association With Atrial Fibrillation: A Traditional Review That finding hasn’t been tested in large randomized trials, so it is far from settled, but it fits the broader picture of acid exposure being one contributor to an already-susceptible heart’s electrical instability.
Why Reflux Mimics a Heart Attack
One reason the reflux-heart-rate question comes up so often is that reflux episodes can feel alarmingly similar to cardiac events. Chest tightness, burning behind the breastbone, pressure that radiates toward the shoulder or jaw: these symptoms overlap between heartburn and angina. In a study that simultaneously monitored esophageal acid exposure, esophageal motility, and heart rhythm in patients with unexplained chest pain, about 17% of pain episodes were associated with acid reflux, while only a single episode out of the entire dataset was linked to actual ischemic changes on the heart tracing.11Digestive Diseases and Sciences. Ambulatory esophageal manometry, pH-metry, and Holter ECG monitoring in patients with atypical chest pain
GERD is considered the most common cause of noncardiac chest pain, which is chest pain that persists after cardiac workup rules out a heart problem.12PubMed Central. Noncardiac chest pain: epidemiology, natural course and pathogenesis The trouble is that the anxiety produced by the chest pain itself can set off a racing pulse, sweating, and a sense of dread that makes the whole episode feel even more cardiac. You end up in a feedback loop: reflux causes chest pain, chest pain triggers an anxiety-driven heart rate spike, the fast heartbeat makes you more convinced something is wrong with your heart, and the stress worsens the reflux. Breaking that loop often starts with getting the reflux diagnosed and treated, which removes the trigger for the cascade.
Reflux and Electrical Changes Beyond Heart Rate
Heart rate is not the only cardiac parameter that reflux can alter. A study comparing people with GERD to healthy controls found that certain measurements of the heart’s electrical recovery phase were significantly different in the reflux group. Specifically, markers related to how evenly the heart muscle repolarizes after each beat were elevated in people with GERD.13PubMed Central. Gastroesophageal reflux disease is associated with abnormal ventricular repolarization indices These repolarization indices matter because when they are prolonged or uneven, the heart becomes more vulnerable to dangerous rhythm disturbances. The clinical significance of this finding is still being worked out, and it doesn’t mean that everyone with heartburn is at risk for a serious arrhythmia. But it does suggest that chronic acid exposure has effects on the heart’s electrical behavior that go beyond a simple change in how fast it beats.
Exercise as a Double Trigger
If you’ve ever noticed reflux flaring up during a run or a hard workout and your heart pounding at the same time, there may be more going on than just exertion. Aerobic exercise, especially intense or prolonged exercise, is a well-known trigger for acid reflux in otherwise healthy people. The mechanical jostling, increased abdominal pressure, and reduced blood flow to the gut during exercise all contribute. Separately, acid exposure in the esophagus has been linked to atrial fibrillation and other rhythm disturbances. Researchers have proposed that these two bodies of evidence form a chain: exercise provokes reflux, and the reflux then provokes the arrhythmia.14PubMed Central. Running, esophageal acid reflux, and atrial fibrillation: a chain of events linked by evidence from separate medical literatures
This is particularly relevant for endurance athletes, who have a well-documented higher-than-expected rate of atrial fibrillation. The conventional explanation focuses on structural heart changes from years of intense training, but the reflux pathway offers an additional or contributing mechanism. If you experience palpitations specifically during or after exercise and also have reflux symptoms at those times, managing the reflux with timing of meals, avoiding known trigger foods before training, or medication may help with both problems at once.
What the Evidence Says About Infants
Parents of babies with reflux are sometimes told that acid episodes can cause dangerous drops in heart rate, called bradycardia. This concern is especially common in neonatal intensive care units, where preterm infants frequently have both reflux and heart rate dips. But the evidence is less alarming than the worry suggests. A study that simultaneously monitored acid reflux and heart rate in both preterm and term infants found that the vast majority of reflux episodes were not linked in time to any heart rate changes. Brief, minor heart rate dips did occur more often in preterm babies, but simultaneous reflux-plus-bradycardia events were rare and the study concluded that most reflux episodes are simply not connected to heart rate changes in infants.15PubMed. Bradycardia and gastroesophageal reflux in term and preterm infants: is there any relation?
That doesn’t mean the two never coincide, but it does mean that the reflexive assumption that every bradycardia spell in a refluxing baby is caused by the reflux is not well supported. Preterm infants have immature autonomic nervous systems that produce heart rate variability for many reasons. Treating reflux aggressively in hopes of preventing bradycardia episodes may not address the actual cause.
Long-Term Acid-Suppression Medication and Heart Health
Proton pump inhibitors are the workhorse medications for controlling GERD, and they are effective at reducing acid production. But they were originally approved for short-term use, typically a few weeks to a couple of months. Because they are now available without a prescription, many people take them continuously for years without medical oversight. Research has raised concerns that long-term PPI use may accelerate vascular aging, potentially contributing to cardiovascular risk over time through mechanisms that have nothing to do with acid suppression itself.16PubMed Central. Cardiovascular Risk of Proton Pump Inhibitors
This creates an uncomfortable tension. On one hand, untreated GERD with ongoing esophageal inflammation appears to carry its own cardiac risks, including the atrial fibrillation association described earlier. On the other hand, the main treatment for that inflammation may introduce a different set of cardiovascular concerns when used for years. The practical takeaway is not to stop your medication, but to periodically revisit with your doctor whether you still need it at the dose you are taking. Many people on long-term PPIs can step down to a lower dose, switch to an as-needed approach, or transition to an H2 blocker with a milder side-effect profile.
Sorting Out What Is Actually Happening
If you have reflux and have noticed your heart rate climbing or skipping beats, the hardest part is figuring out which of several overlapping mechanisms is responsible. The anxiety-adrenaline loop, the chronic autonomic shift, mechanical compression from a hiatal hernia, direct vagal reflexes, and exercise-triggered reflux are all plausible culprits, and more than one can operate at the same time. A resting heart rate that has crept up over months points toward the autonomic imbalance that accompanies chronic GERD. Sudden palpitations during or right after meals suggest gastrocardiac syndrome. Skipped beats or an irregular rhythm that comes and goes could reflect premature contractions from mechanical irritation or early atrial fibrillation.
None of these scenarios is something you should diagnose on your own. Heart symptoms always warrant a proper cardiac evaluation first, because the whole reason reflux is such a clinical headache is that it overlaps so convincingly with genuine heart disease. But once cardiac causes have been investigated and either ruled out or identified as mild, treating the reflux itself becomes a legitimate cardiac intervention. In some documented cases, fixing a hernia or controlling acid exposure resolved arrhythmias that had resisted standard cardiac treatment for months. The gut and the heart are closer neighbors than most people realize, and what happens in one rarely stays completely contained.