Most hiatal hernias produce no symptoms at all, which is why many people have one without knowing it. When symptoms do appear, persistent heartburn and acid reflux are the most common signs. A hiatal hernia happens when part of your stomach pushes up through the opening in your diaphragm (the muscle separating your chest from your abdomen), making it easier for stomach acid to flow back into your esophagus.
The Most Common Symptoms
The hallmark sign is frequent heartburn, a burning sensation in your chest that often gets worse after eating, lying down, or bending over. Because the hernia disrupts the natural barrier between your stomach and esophagus, acid escapes upward more easily. This is why hiatal hernias and GERD (gastroesophageal reflux disease) overlap so heavily.
Beyond heartburn, symptoms can include:
- Regurgitation of food or sour liquid into the back of your throat
- Trouble swallowing or a sensation of food getting stuck
- Feeling full unusually fast during meals
- Chest or upper abdominal pain
- Shortness of breath
- A dry cough or bad breath
- Nausea or vomiting
Larger hernias tend to cause more noticeable symptoms. A small hernia may only produce mild, occasional heartburn that responds well to antacids, while a larger one can cause daily reflux, difficulty swallowing, and chest pressure that genuinely mimics heart problems.
Why Many People Never Know They Have One
Over 95% of hiatal hernias are the “sliding” type, where the junction between your esophagus and stomach slides up through the diaphragm intermittently. Most of these are small and cause no symptoms whatsoever. Many are discovered by accident during imaging or procedures done for completely unrelated reasons. Prevalence increases steadily with age: roughly 2.4% of people in their 50s have one, rising to about 14% in their 70s and nearly 17% by the time people reach their 80s and 90s.
Less common types (making up only 5 to 10% of cases) involve a larger portion of the stomach, or even other organs, pushing through the diaphragm. About half of people with these larger hernias still have no symptoms. The other half may experience more mechanical problems like food getting stuck, chest pressure, or shortness of breath from the hernia pressing on nearby structures.
When Chest Pain Feels Like a Heart Attack
One of the most alarming parts of a hiatal hernia is chest pain that can feel identical to a heart problem. Even experienced doctors sometimes can’t distinguish between the two based on symptoms alone. There are patterns that help, though. Heartburn from a hiatal hernia typically burns in the chest and upper abdomen, worsens after meals or when you lie down, improves with antacids, and often comes with a sour taste in your mouth. A heart attack more commonly involves sudden crushing chest pain brought on by physical exertion, along with difficulty breathing.
These are tendencies, not rules. If you experience sudden, severe chest pain, treat it as a cardiac emergency until proven otherwise.
How Hiatal Hernias Are Diagnosed
You can’t diagnose a hiatal hernia from symptoms alone. Confirmation requires imaging or a direct look inside your digestive tract. The most common approaches are:
- Barium swallow X-ray: You drink a chalky liquid that coats the lining of your esophagus and stomach, making them visible on X-ray. This is considered the preferred test for identifying a hiatal hernia. If the junction between your esophagus and stomach sits more than 1 to 2 centimeters above the diaphragm on the image, a sliding hernia is present. Lying face-down during the test makes the hernia easier to spot than standing upright.
- Upper endoscopy: A thin, flexible tube with a camera is passed down your throat to directly view your esophagus and stomach. This lets a doctor see inflammation, damage to the esophageal lining, and how well the valve between your esophagus and stomach is functioning. Doctors grade this valve on a scale from I (normal, with tissue gripping snugly around the scope) to III (barely any fold present, with a visible gap).
- Esophageal manometry: This test measures the strength and coordination of muscle contractions in your esophagus when you swallow. It’s particularly useful when the main concern is difficulty swallowing rather than reflux.
A hiatal hernia can also show up incidentally on a CT scan or even a routine chest X-ray, where a large hernia sometimes appears as a mass near the heart containing an air-fluid level.
What Increases Your Risk
Anything that repeatedly increases pressure inside your abdomen can push your stomach upward through the diaphragm over time. Obesity is one of the strongest risk factors, as excess abdominal weight creates constant upward pressure. Pregnancy does the same thing temporarily. Chronic coughing, frequent heavy lifting, and repeated straining during bowel movements all contribute. Age plays a major role because the muscles of the diaphragm naturally weaken over time, which is why prevalence climbs so sharply after age 60.
Some people are born with a larger-than-normal hiatal opening, which makes herniation more likely regardless of other factors.
Symptoms That Need Immediate Attention
Rare but serious complications can occur when a hernia becomes trapped (incarcerated) or its blood supply gets cut off (strangulated). Large hernias carry the highest risk because they can allow the stomach to twist on itself, potentially cutting off blood flow.
Warning signs include sudden, severe abdominal or chest pain that doesn’t go away and keeps getting worse, nausea and vomiting (especially if you can’t keep anything down), and skin color changes around the abdomen. Vomiting blood or passing black, tarry stools suggests bleeding in the digestive tract. Any of these symptoms warrant emergency medical care.
What to Expect if You’re Diagnosed
Small, asymptomatic hiatal hernias typically require no treatment. If reflux symptoms are your main issue, management usually starts with lifestyle changes: eating smaller meals, not lying down for two to three hours after eating, elevating the head of your bed, losing weight if needed, and avoiding foods that trigger reflux. Over-the-counter antacids or acid-reducing medications often control symptoms effectively.
Surgery becomes a consideration when symptoms are severe, when medications fail to control reflux adequately, or when the hernia is large enough to pose a risk of complications like twisting or strangulation. The procedure involves pulling the stomach back below the diaphragm, narrowing the hiatal opening, and often wrapping the top of the stomach around the lower esophagus to reinforce the valve. Most of these repairs are done laparoscopically, meaning smaller incisions and shorter recovery times.