A hiatal hernia can affect your heart in several clinically documented ways, from physically compressing the chambers that sit directly in front of it to triggering irregular heartbeats through nerve stimulation. Most small hiatal hernias never cause cardiac symptoms at all, but large ones occupy enough space in the chest to push against the left atrium, squeeze coronary blood vessels, and even produce ECG readings that look like a heart attack. The connection between the stomach and the heart in this scenario is more direct and mechanical than most people expect.
Why the Stomach and the Heart Are Closer Than You Think
The heart sits in the middle of the chest, and the esophagus runs just behind it, passing through a small opening in the diaphragm called the hiatus before connecting to the stomach below. In a hiatal hernia, part of the stomach pushes upward through that opening and into the chest cavity. When the hernia is small, there may be no meaningful contact with cardiac structures. But when it is large, the herniated stomach can press directly against the back wall of the heart, particularly the left atrium, which is the chamber closest to the esophagus.
A CT-based study of 30 patients with large hiatal hernias found that about three-quarters had moderate to severe compression of the left atrium, and roughly 87% had compression of the coronary sinus, the major vein that drains blood from the heart muscle itself.1PubMed. Left atrial compression and the mechanism of exercise impairment in patients with a large hiatal hernia Compression of the pulmonary veins, which carry oxygenated blood from the lungs into the left atrium, was also common. This is not a subtle anatomical quirk. When a structure the size of a distended stomach wedges itself behind the heart, it physically reshapes how blood flows through the cardiac chambers.
Arrhythmias and Hiatal Hernias
The most studied cardiac consequence of hiatal hernias is their association with atrial fibrillation, the most common sustained heart rhythm disorder. The connection makes anatomical sense: if something is pressing on the left atrium from behind, the electrical signals that coordinate the atrium’s contraction can be disrupted. A large database study spanning 30 years found that among more than 111,000 patients diagnosed with a hiatal hernia, about 7% also had atrial fibrillation. In younger patients under 55, the association was especially striking. Men with a hiatal hernia in that age group had roughly 17.5 times the rate of atrial fibrillation compared to the general population, and women had about 19 times the rate.2PubMed Central. Hiatal Hernia Is Associated With an Increased Prevalence of Atrial Fibrillation in Young Patients
Those numbers do not prove that the hernia caused the arrhythmia in every case, but the pattern is hard to dismiss, especially when case reports describe patients whose atrial fibrillation disappeared after the hernia was repaired. Beyond atrial fibrillation, hiatal hernias have been linked to atrial flutter, premature ventricular contractions, episodes of fast heart rate, and unusually slow heart rate.3PubMed Central. A large hiatal hernia causing frequent premature ventricular contractions with bigeminy: A case report and review of literature One case report described a patient with recurrent atrial fibrillation episodes in the absence of the usual risk factors for arrhythmia, with the hiatal hernia identified as the likely trigger.4PubMed Central. Hiatal Hernia: A Possible Trigger for Atrial Fibrillation
Interestingly, even small hiatal hernias may play a role. A radiology study found that hernias measuring 2 centimeters or less were about six times more common in patients with atrial fibrillation than in a control group, a statistically significant difference, though the overall association was weak.5Polish Journal of Radiology. Small hiatal hernia as a risk factor of atrial fibrillation The takeaway is that you do not necessarily need a massive hernia to see cardiac rhythm effects, though larger hernias are more consistently implicated.
The Vagus Nerve Connection
Not all cardiac effects from a hiatal hernia come from direct physical squeezing. Some are triggered through the vagus nerve, which runs from the brainstem through the neck and chest to the abdomen, touching both the heart and the digestive organs along the way. When a herniated stomach irritates or stretches the vagus nerve, it can send signals that slow the heart, cause palpitations, or provoke other rhythm disturbances.
This phenomenon has a name: Roemheld syndrome, sometimes called gastrocardiac syndrome. It was first described over a century ago, and it refers to cardiac symptoms that originate from gastrointestinal problems. A 2024 review identified several GI conditions that can trigger it, including hiatal hernia, gallstones, excessive intestinal gas, and acid reflux.6PubMed. Exploring Roemheld syndrome: a comprehensive review with proposed diagnostic criteria One proposed mechanism is that when the stomach herniates upward, the fundus (the dome-shaped top of the stomach) physically contacts and stimulates the anterior vagal nerve trunk, creating a more potent trigger for arrhythmias than reflux alone.7PubMed Central. Resolution of Roemheld Syndrome After Hiatal Hernia Repair and LINX Placement: Case Review
Roemheld syndrome is underdiagnosed partly because doctors tend to think of cardiac and GI symptoms as belonging to separate organ systems. If you feel your heart racing or skipping beats after a meal and your cardiologist finds nothing structurally wrong with your heart, the connection to a hiatal hernia or reflux is often missed. The condition is real, though, and responds to treatment of the underlying GI problem.
When a Hiatal Hernia Mimics a Heart Attack
One of the more alarming ways a hiatal hernia can affect the heart is by producing ECG changes and symptoms that look virtually identical to a heart attack. An 89-year-old woman presented with persistent chest pain and an ECG showing hyperacute T waves, a pattern strongly suggestive of the early phase of a heart attack. After endoscopic drainage of the hernia contents reduced the pressure on her heart, both the chest pain and the ECG abnormalities resolved completely.8Internal Medicine. Pseudo-hyperacute T Waves in a Giant Hiatal Hernia
In another case, a patient undergoing a cardiac procedure had her symptoms reproduced simply by lying flat, which allowed the giant hernia to slide under the heart. Coronary angiography showed that blood flow in the left circumflex artery was physically interrupted by the hernia’s pressure. Once the stomach contents were drained, coronary flow returned to normal, but cardiac enzymes were elevated afterward, confirming that actual heart muscle damage had occurred.9International Heart Journal. Myocardial Infarction Associated with a Giant Hiatal Hernia This case is remarkable because it shows a hiatal hernia can go beyond mimicking a heart attack to actually causing one, by compressing a coronary artery tightly enough to cut off blood supply.
A case reported in a European cardiology journal described a patient who developed acute chest pain and diffuse ST-segment elevation during an exercise test at modest effort, leading to an emergency referral to cardiology. The culprit turned out to be a giant hiatal hernia, not coronary artery disease.10European Heart Journal – Case Reports. A case report of a giant hiatal hernia mimicking an ST-elevation myocardial infarction These diagnostic traps are clinically important. A patient rushed to the catheterization lab for what appears to be a heart attack may undergo invasive procedures before anyone considers that a hernia is the cause.
Diagnostic Confusion on Imaging
The mimicry extends beyond ECG readings. On echocardiography, a hiatal hernia can appear as a mass behind or inside the left atrium, leading doctors to suspect a cardiac tumor, blood clot, or other space-occupying lesion. A review in gastroenterology literature noted that hiatal hernias can simulate the appearance of left atrial masses on echocardiography and can also produce shortness of breath, chest pain, and fainting through cardiac compression.11PubMed Central. A Differential Diagnosis for Left Atrial Mass on Transthoracic Echocardiography: Hiatus Hernia Emergency department cases have documented older patients initially worked up for a suspected heart mass that turned out to be a hernia once CT or other imaging clarified the picture.12PubMed Central. Hiatal Hernia: The Great Masquerade in the Emergency Department
The distinction between a hiatal hernia and coronary artery disease on clinical grounds alone has been recognized as a diagnostic challenge for decades. A paper in the Archives of Surgery noted that differentiating between hiatal hernia symptoms and angina pectoris from coronary disease is “of paramount importance.”13Archives of Surgery. Differential Diagnosis of Hiatus Hernia and Coronary Artery Disease That paper dates to 1949, which means clinicians have been grappling with this overlap for more than 75 years. It remains a live problem today because the symptoms, chest pain, shortness of breath, palpitations, and fainting, are shared by both conditions, and both conditions are common in older adults.
Why Symptoms Often Get Worse After Eating
If your cardiac-seeming symptoms flare up after meals, a hiatal hernia deserves consideration. Eating fills the stomach with food and gas, and if the stomach is herniated into the chest, that added volume increases pressure on the heart. Researchers have documented that patients with large hiatal hernias frequently experience shortness of breath after meals.14PubMed. Feeding Induces Left Atrial Compression and Impedes Cardiac Filling in Patients With Large Hiatal Hernia Palpitations and chest discomfort after eating are also commonly reported.15PubMed. Influence of large hiatus hernia on cardiac volumes. A prospective observational cohort study by cardiovascular magnetic resonance
In extreme cases, eating can cause fainting. One case report described an elderly woman with a giant hiatal hernia who experienced repeated episodes of postprandial syncope over several years. The mechanism was that food and gastric contents expanded the herniated stomach enough to significantly compress cardiac chambers and impede blood flow to the brain.16PubMed Central. Postprandial cardiogenic syncope caused by gastric polyp-induced pyloric obstruction in an elderly woman with a giant hiatal hernia: a case report
The postprandial pattern is a useful clinical clue. Heart attacks do not typically arrive 20 minutes after lunch with clockwork regularity. If your chest tightness, breathlessness, or palpitations consistently track with meals and especially with large meals, the connection to the stomach rather than the coronary arteries becomes more plausible. Lying down after eating can make things worse, since gravity no longer helps keep the hernia contents from pressing upward against the heart.
Cardiac Arrest From a Hernia
The most extreme cardiac event attributed to a hiatal hernia is cardiac arrest. A paraesophageal hernia, the type where the stomach slides up alongside the esophagus rather than around it, was documented to compress the right ventricle severely enough to reduce the heart’s ability to fill with blood and pump it forward. The patient went into cardiac arrest, and chest CT confirmed that the hernia was the mechanical cause.17The Annals of Thoracic Surgery. Cardiac Arrest Caused by a Large Paraesophageal Hernia This is exceptionally rare but serves as a reminder that a very large hernia in the wrong position is not just an annoyance; it can be life-threatening through purely mechanical means.
A case of a patient with a giant hiatal hernia who presented with stable angina and three syncopal episodes over three months saw complete improvement of symptoms after surgical repair, further illustrating the range of severity.18PubMed. Giant hiatal hernia presenting with stable angina pectoris and syncope–a case report
Can Fixing the Hernia Fix the Heart Problem?
In many documented cases, yes. A systematic review found that hiatal hernia repair and acid-suppression therapy both resolved arrhythmias in published case reports and case series, with rhythm improvement typically occurring shortly after treatment.19PubMed. Exploring the Link-Hiatal Hernia Repair and GERD Treatments for Managing Arrhythmias: A Systematic Review One striking case involved a patient with hemodynamically unstable atrial fibrillation, meaning the arrhythmia was severe enough to require electrical cardioversion, whose arrhythmia was definitively reversed after surgical correction of the hiatal hernia.20PubMed Central. Reversal of unstable atrial fibrillation after surgical correction of hiatus hernia: A case report
It is worth noting that the evidence here comes primarily from case reports and small series, not from large randomized trials. That means we can say confidently that some individuals’ cardiac symptoms resolve with hernia repair, but we cannot say with precision how often this happens or which patients are most likely to benefit. If you have both a hiatal hernia and an unexplained arrhythmia, the surgical option is worth discussing with your doctors, but the decision will depend on the hernia’s size, your symptoms, and whether other explanations for the arrhythmia have been ruled out.
Acid Reflux, Blood Pressure, and the Broader Picture
The cardiac effects of a hiatal hernia are not limited to rhythm problems and mechanical compression. Acid reflux, which is extremely common in hiatal hernia patients, may also influence blood pressure. A study of patients with essential hypertension found that about 44% also had gastroesophageal reflux. Among those with reflux, about 15% of high blood pressure episodes occurred at the same time as reflux episodes. Reflux patients had significantly higher nighttime blood pressure, and anti-acid treatment brought about meaningful reductions in both reflux and blood pressure readings.21PubMed Central. The Role of Gastroesophageal Reflux in Provoking High Blood Pressure Episodes in Patients With Hypertension
This adds another layer to the relationship. Hiatal hernias promote reflux, reflux appears to provoke blood pressure spikes (probably through pain-related sympathetic nervous system activation), and poorly controlled nighttime blood pressure is itself a cardiovascular risk factor. For someone with both hypertension and a hiatal hernia, treating the reflux aggressively may have benefits beyond heartburn relief.
Long-Term Acid Suppression and Heart Risk
Many people with hiatal hernias take proton pump inhibitors for years to manage reflux. A review in The American Surgeon noted that while both PPIs and surgical anti-reflux procedures effectively control reflux, long-term PPI use has been associated with an increased risk of cardiovascular events, kidney disease, and disruption of gut bacteria.22PubMed. Proton Pump Inhibitors, Associated Complications, and Alternative Therapies: A Shifting Risk Benefit Ratio The review suggested that surgical reflux control may be a better long-term option for some patients. This does not mean PPIs are dangerous for everyone who takes them, but if you have been on high-dose acid suppression for years because of a hiatal hernia and you also have cardiovascular concerns, it is reasonable to ask your doctor whether surgical repair might reduce both the hernia’s direct effects on the heart and the need for chronic medication.
The irony is worth appreciating: a hiatal hernia can affect your heart through direct compression, nerve stimulation, and reflux-mediated blood pressure changes, and the medication used to treat the reflux may carry its own cardiovascular considerations over time. These overlapping pathways are part of why the relationship between hiatal hernias and cardiac symptoms remains underrecognized and undertreated in clinical practice.