A hiatal hernia happens when part of your stomach pushes up through the diaphragm, the large muscle that separates your chest from your abdomen. Your esophagus (the tube that carries food to your stomach) passes through a small opening in the diaphragm called the hiatus. When that opening stretches or weakens, the upper portion of your stomach can slide through it into the chest cavity. More than 95% of hiatal hernias are the “sliding” type, where the junction between the esophagus and stomach moves up and down. Many people have one and never know it.
Types of Hiatal Hernia
There are four types, classified by what moves through the diaphragm and how far.
- Type I (sliding): The junction where the esophagus meets the stomach slides upward into the chest intermittently. This accounts for over 95% of all hiatal hernias and is usually the least dangerous.
- Type II (paraesophageal): The top of the stomach bulges up beside the esophagus, but the esophagus-stomach junction stays in its normal position below the diaphragm. This is less common but more likely to cause complications.
- Type III: A combination of Types I and II, where both the junction and the upper stomach push through the opening.
- Type IV: Other organs besides the stomach, such as the colon or spleen, migrate through the hiatus into the chest cavity.
Types II through IV are grouped together as paraesophageal hernias and make up only 5 to 10% of diagnosed cases. They tend to be larger and are more likely to need surgical attention.
Common Symptoms
Small hiatal hernias often produce no symptoms at all, and many people only discover theirs incidentally during imaging for something else. When symptoms do appear, they’re usually tied to chronic acid reflux (GERD). The most frequent complaints are heartburn (a burning sensation in the chest, especially after eating), non-cardiac chest pain that can mimic heart-related pain, and indigestion with a feeling of fullness soon after starting a meal.
Larger hernias can cause additional problems: nausea from stomach compression, shortness of breath if the hernia presses against the lungs, and a sense of pressure or pain in the upper abdomen or lower chest. You might notice these symptoms more during activities that increase abdominal pressure, like bending over, coughing, or lifting heavy objects. Some people also experience regurgitation, where swallowed food or liquid flows back into the mouth, or difficulty swallowing.
Vomiting blood or passing black, tarry stools can signal bleeding in the digestive tract and warrants immediate medical attention.
What Causes a Hiatal Hernia
The hiatus can weaken or widen for several reasons, and often it’s a combination of factors rather than a single cause. Age plays a major role: the diaphragm naturally loses some of its muscle tone over the years, which is why hiatal hernias become increasingly common in middle age and beyond. Anything that repeatedly raises pressure inside the abdomen can stretch the opening, including obesity, pregnancy, chronic coughing, frequent heavy lifting, and straining during bowel movements.
Some people are born with a larger-than-normal hiatus, giving the stomach an easier path upward. Prior abdominal surgery or injury to the diaphragm can also contribute. Smoking weakens connective tissue throughout the body, including the structures that keep the hiatus tight.
How It’s Diagnosed
The most reliable way to identify a hiatal hernia is a barium swallow test, also called an upper GI series. You drink a chalky liquid that coats your esophagus and stomach, then X-rays capture the outline in real time as you swallow. This gives a clear picture of whether the stomach is pushing through the diaphragm and how far. Small sliding hernias can sometimes be missed because they slip back into position, but the dynamic nature of the test (watching you swallow in real time) helps catch most cases.
Upper endoscopy, where a thin camera is passed down your throat, is another common way hiatal hernias are discovered, often during an evaluation for reflux symptoms. Your doctor may also order pH monitoring to measure how much acid is flowing back into your esophagus, which helps determine whether the hernia is causing significant reflux damage.
Lifestyle Changes That Help
For the majority of people with a sliding hiatal hernia, symptom management starts with everyday adjustments rather than surgery. These changes target the root issue: reducing acid reflux and lowering pressure on the hernia.
- Meal timing: Eat at least three to four hours before lying down, so your stomach has time to empty.
- Portion size: Smaller, more frequent meals put less pressure on the stomach than large ones.
- Trigger foods: Fatty foods, citrus, caffeine, and alcohol all relax the valve between the esophagus and stomach or increase acid production.
- Sleep position: Elevating the head of your bed by about six inches (using a wedge or bed risers, not just extra pillows) helps gravity keep acid in your stomach overnight.
- Weight management: Excess abdominal weight pushes the stomach upward, so losing even a modest amount can reduce symptoms noticeably.
- Quit smoking: Smoking weakens the lower esophageal valve and the diaphragm itself.
Over-the-counter antacids and acid-reducing medications are often effective for controlling reflux symptoms when lifestyle changes alone aren’t enough.
When Surgery Becomes Necessary
Surgery is typically considered when symptoms can’t be controlled with medication and lifestyle changes, when the hernia is large, or when there’s a risk of serious complications. The decision depends on the hernia’s size and type, how severe the symptoms are, and whether non-surgical approaches have failed.
Paraesophageal hernias (Types II through IV) carry a higher risk of dangerous complications. In one long-term study of 29 patients with paraesophageal hernias, about 30% experienced incarceration or strangulation, meaning the herniated stomach became trapped or its blood supply was cut off. A larger series found that half of patients with massive incarcerated paraesophageal hernias had the stomach twisted on its axis, a condition called gastric volvulus. These complications are surgical emergencies.
The most common surgical approach is laparoscopic fundoplication, performed through small incisions. The surgeon pulls the stomach back below the diaphragm, narrows the hiatal opening by stitching the muscle edges together, and wraps the top of the stomach around the lower esophagus to reinforce the valve that prevents reflux. A full wrap (360 degrees) and a partial wrap (270 degrees) both produce significant improvements in acid reflux scores and symptom relief. Some asymptomatic patients with large paraesophageal hernias may also be offered repair to prevent future emergencies, though guidelines note this decision is made on a case-by-case basis.
What Recovery Looks Like
After laparoscopic hiatal hernia repair, you’ll start with clear liquids as soon as you’re fully awake and not nauseated, usually within hours of the procedure. If those go well, you’ll move to a soft or pureed diet before going home. Plan on staying with that soft diet for about two weeks. At your follow-up appointment, if swallowing feels normal, you’ll begin gradually reintroducing regular foods. If you’re still having trouble swallowing at two weeks, the soft diet may continue for up to six weeks total.
Large pills need to be crushed for the first two weeks. Lifting is restricted to no more than 15 pounds for six weeks. Most people lose 10 to 15 pounds during the first four to six weeks after surgery because of the dietary restrictions and smaller portions, and this is expected. Weight typically stabilizes once you return to a normal diet.
Both the full-wrap and partial-wrap techniques show strong results in controlling reflux long-term. The main trade-off is that some people experience temporary difficulty swallowing or bloating in the weeks following surgery as swelling resolves and the wrap settles into place.