A hernia in your stomach area forms when tissue or an organ pushes through a weak spot in the surrounding muscle or connective tissue. This happens through a combination of two things: a vulnerable area in the muscle wall (sometimes present from birth, sometimes created by surgery or aging) and repeated or sudden pressure from inside your abdomen. The weakness gives way, and tissue bulges through the gap.
People searching for a “stomach hernia” are usually dealing with one of two types: hernias in the abdominal wall (where you can often see or feel a bulge) or hiatal hernias (where part of the stomach slides up through the diaphragm into the chest cavity). Both develop through similar pressure-and-weakness dynamics, but they feel quite different and show up in different ways.
What Creates the Weak Spot
Your abdominal wall is built from layers of muscle and tough connective tissue called fascia. In some people, these layers are naturally thinner in certain areas, particularly near the groin, the belly button, and the midline between the belly button and breastbone. Genetics play a real role here: people with a family history of hernias tend to have thinner connective tissue in the areas most vulnerable to herniation.
Other things that weaken the wall over time include aging (the tissue loses elasticity), obesity, rapid weight loss, and previous abdominal surgery. Any incision through the abdominal wall creates a permanent weak point. Nerve damage from prior operations can also reduce the muscle’s ability to contract and reinforce itself, which is why hernias sometimes appear months or years after surgery at the old incision site.
What Pushes Tissue Through
The second ingredient is pressure. Your abdominal cavity is a closed space, and anything that raises the pressure inside it pushes outward against the walls. When the wall has a weak point, that pressure can force tissue through like squeezing a balloon through a gap in a fence.
The most common pressure sources are:
- Heavy lifting, especially with poor technique or breath-holding
- Chronic coughing from conditions like COPD, asthma, or prolonged illness
- Straining during bowel movements or urination
- Significant obesity, which keeps constant pressure on the abdominal wall
- Pregnancy, which stretches and thins the abdominal muscles
- Fluid buildup in the abdomen from liver disease or other conditions
These don’t always cause a hernia overnight. Clinical evidence points to repetitive stress as a key factor. Each cough, each heavy lift, each strain adds a small amount of force to an already weakened area. Over time, the tissue gives way gradually rather than tearing all at once, though sudden onset from a single heavy lift is also possible.
Hernias in the Abdominal Wall
The hernias you can typically see and feel fall into a few categories based on location. An epigastric hernia appears between the belly button and breastbone, right along the midline. You’ll notice a bulge under the skin when standing that may disappear when you sit or lie down. It causes a dull ache in the upper belly that tends to worsen throughout the day, and sharp pain when you cough, lift, or strain. Unlike hiatal hernias, epigastric hernias don’t cause heartburn or acid reflux.
Umbilical hernias form at or near the belly button. Inguinal hernias develop in the groin, and incisional hernias appear at the site of a previous surgical cut. Spigelian hernias, which are rarer, form along the side of the abdomen where the muscle layers transition to connective tissue. These are particularly associated with obesity, aging, and rapid weight loss.
Hiatal Hernias: When the Stomach Slides Upward
A hiatal hernia is different from an abdominal wall hernia. Instead of pushing outward through the belly wall, part of the stomach pushes upward through the hiatus, a natural opening in the diaphragm where the esophagus passes through to reach the stomach. The diaphragm is made of muscle, and the hiatus is formed by a split in the right side of that muscle. A ligament connects the diaphragm to the lower esophagus, anchoring the stomach in place while still allowing some movement during swallowing.
In a hiatal hernia, that ligament stretches and loosens. A pouch of the abdominal lining extends upward through the opening, and the upper portion of the stomach follows. This is called a “sliding” hernia because part of the stomach wall itself forms the hernia’s boundary rather than being fully wrapped in tissue. The hallmark symptom is acid reflux, because the normal barrier between the stomach and esophagus gets displaced.
Hiatal hernias become significantly more common with age. A large study using CT imaging on over 3,200 people between ages 53 and 94 found prevalence rose from 2.4% in the sixth decade of life to 7% in the seventh decade, 14% in the eighth, and 16.6% in the ninth. Many people with small hiatal hernias have no symptoms at all and never know they have one.
How Hernias Are Found
Abdominal wall hernias are often diagnosed by physical exam alone. A provider can feel the bulge, especially when you stand or cough. If the size or location is unclear, imaging with ultrasound, CT, or MRI can confirm the diagnosis.
Hiatal hernias require different tools. A barium swallow (where you drink a contrast liquid while X-rays are taken) is highly effective at detecting hiatal hernias and measuring their size, with nearly 100% sensitivity in studies. Endoscopy, where a camera is passed down the throat, is excellent for evaluating the lining of the esophagus and stomach but much less reliable for identifying the type or size of the hernia itself. One study found endoscopy correctly classified the hernia type only about 8% of the time, compared to nearly 39% for barium imaging. When symptoms include chest pain or shortness of breath, both tests are typically used together.
When a Hernia Becomes Dangerous
Most hernias are uncomfortable but not immediately dangerous. The risk changes when a hernia becomes incarcerated, meaning the bulging tissue gets stuck in the gap and can’t be pushed back in. At this stage, the abdominal muscles can squeeze tightly enough around the trapped tissue to cut off its blood supply. This is called strangulation, and it’s a surgical emergency.
Signs that a hernia has strangulated include sudden, severe pain in the abdomen or groin that keeps getting worse, nausea and vomiting, and color changes in the skin around the bulge. The skin may first look paler than usual, then turn darker or reddish. If you experience these symptoms, it requires immediate emergency care because the trapped tissue can die without blood flow.
Reducing Your Risk
You can’t eliminate every risk factor, but you can reduce the abdominal pressure that pushes hernias through weak spots. The most practical change involves how you breathe during exertion. The instinct when lifting something heavy or standing up from a chair is to hold your breath and bear down. This dramatically spikes pressure inside your abdomen.
Instead, breathe out during the moment of effort while pulling your abdominal muscles inward rather than letting them bulge outward. When getting out of a chair, scoot to the edge, lean forward, and push up with your arms rather than straining with your core. During exercise, maintain that same pattern: exhale on exertion, keep the abdominals drawn in, and avoid holding your breath.
Managing a chronic cough, treating constipation to avoid straining, and maintaining a healthy weight all reduce the cumulative pressure on your abdominal wall. For people who lift heavy loads regularly, whether at work or in the gym, proper breathing technique isn’t just performance advice. It’s the single most effective way to protect against hernia formation over time.
How Hernias Are Repaired
Most hernias don’t resolve on their own. Small, symptom-free hernias may simply be monitored, but hernias that cause pain or grow over time typically require surgical repair. The procedure involves repositioning the tissue that has pushed through the gap and reinforcing the weakened muscle or connective tissue, often with surgical mesh to prevent recurrence.
Most abdominal wall hernia repairs are now done laparoscopically through small incisions using a camera and specialized instruments. Robotic-assisted surgery is increasingly used as well, with some evidence suggesting it may result in lower recurrence rates, though this hasn’t been confirmed in randomized trials. Both minimally invasive approaches mean shorter recovery times compared to traditional open surgery, with most people returning to normal activities within a few weeks rather than months.