A hernia happens when an internal organ or tissue pushes through a weak spot in the muscle or connective tissue wall that normally holds it in place. Most hernias involve part of the abdominal contents bulging through a gap in the abdominal wall, creating a visible lump under the skin. They’re remarkably common: roughly 14% of men and 2% of women will be hospitalized for a groin hernia over a 20-year period.
How a Hernia Forms
Your abdominal organs are contained by layers of muscle and a tough sheet of connective tissue called fascia. When a hole or weak point develops in that barrier, the lining of the abdominal cavity can form a sac that pushes through the gap, carrying tissue or part of an organ (often a loop of intestine) with it. Think of it like an inner tube poking through a worn spot in a tire.
This weak point can be something you’re born with, like a natural opening that didn’t close properly during development, or something that develops over time as muscles weaken with age. The hernia itself is driven by pressure inside the abdomen. Anything that chronically raises that pressure can push tissue through a vulnerable area: straining from constipation, a persistent cough (especially from smoking), heavy lifting, prolonged standing, or pregnancy. These forces don’t always cause the initial weakness, but they exploit one that already exists.
The Most Common Types
Hernias are named for where they occur, and the location determines what symptoms you’ll notice.
- Inguinal hernia: The most common type overall, appearing as a bulge in the groin or at the top of the inner thigh. Far more frequent in men because of a natural opening in the groin wall where the spermatic cord passes through.
- Femoral hernia: Also appears in the groin area but slightly lower than an inguinal hernia. More common in women and carries a higher risk of becoming trapped.
- Umbilical hernia: Tissue pushes through a weakness near the belly button. Common in newborns (often closing on its own) and in adults with obesity or who have had multiple pregnancies.
- Incisional hernia: Develops at the site of a previous abdominal surgery, where scar tissue creates a weak point in the abdominal wall.
- Epigastric hernia: A small bulge that forms in the upper abdomen between the belly button and the breastbone.
- Hiatal hernia: Unlike the others, this one is internal. Part of the stomach pushes upward through the diaphragm into the chest cavity, so there’s no visible bulge on the outside.
What a Hernia Feels Like
The hallmark sign of most hernias is a visible bulge that may come and go. It often becomes more noticeable when you stand up, cough, or strain, and it may disappear when you lie down. This is called a reducible hernia, meaning the tissue slides back into place on its own or with gentle pressure.
Pain varies widely. Some hernias cause no discomfort at all and are only discovered during a routine physical exam. Others produce a dull ache or a dragging sensation at the site, especially after standing for a long time or lifting something heavy. The pain typically gets worse throughout the day and improves with rest.
Hiatal hernias are the exception. Because they’re entirely internal, the symptoms mimic digestive problems rather than producing a visible lump. Most small hiatal hernias cause no symptoms. Larger ones can cause heartburn, acid reflux, regurgitation of food, difficulty swallowing, chest pain, and feeling full quickly after eating. Some people experience shortness of breath. These symptoms overlap significantly with gastroesophageal reflux disease (GERD), so hiatal hernias are sometimes discovered while investigating chronic heartburn.
How Hernias Are Diagnosed
A doctor can often identify an abdominal wall hernia through a physical exam alone, feeling for a bulge or a gap in the muscle when you cough or bear down. If the hernia isn’t obvious on exam but symptoms suggest one, imaging fills in the picture. MRI is the most sensitive and reliable tool for detecting groin hernias that aren’t clearly visible. Ultrasound and CT scans are also used depending on the location and the clinical situation. Hiatal hernias are typically found through imaging of the chest or upper digestive tract, or during an endoscopy.
Treatment and Repair
Not every hernia needs immediate surgery. Small, painless hernias are sometimes monitored with a “watchful waiting” approach, particularly if surgery poses risks for the patient. But hernias don’t heal on their own, and most will gradually get larger over time.
When repair is needed, there are two main surgical approaches. Open repair involves a single incision over the hernia site, where the surgeon pushes the protruding tissue back into place and reinforces the weakened wall. Laparoscopic repair uses several small incisions and a camera to guide the procedure from inside. Both approaches commonly use synthetic mesh to strengthen the repair site. Mesh has consistently been shown to reduce the chance of the hernia coming back compared to stitching the tissue alone, and it tends to shorten both operative time and recovery.
The tradeoffs between the two approaches are modest. Laparoscopic repair typically means less pain in the days afterward and a slightly faster return to normal activities (about four days versus five for open repair). Open mesh repair, however, has shown lower recurrence rates for first-time groin hernias in some studies, with roughly 5% recurring over two years compared to about 10% with laparoscopic repair. For hernias that have come back after a previous repair, the recurrence rates are similar between the two methods.
As with any surgery, possible complications include pain, infection, fluid buildup at the surgical site, and scar tissue forming between internal tissues. When mesh is used, additional risks include the mesh shifting from its original position or shrinking over time, which can sometimes contribute to chronic discomfort. That said, for most patients, mesh repair remains the standard because the benefit of preventing recurrence outweighs these risks.
When a Hernia Becomes an Emergency
Most hernias are not dangerous, but they can become so if the protruding tissue gets trapped. An incarcerated hernia means the tissue is stuck outside the abdominal wall and can’t be pushed back in. If the surrounding muscles then squeeze tightly enough to cut off blood flow to the trapped tissue, it becomes a strangulated hernia. Trapped intestine can begin to die in as little as four hours once blood supply is reduced.
Signs that a hernia has strangulated include sudden, severe pain in the abdomen or groin that keeps getting worse, nausea and vomiting, and skin color changes around the bulge (turning red, pale, or darker than usual). This is a medical emergency requiring surgery right away.
Reducing Your Risk
You can’t prevent every hernia, particularly those caused by congenital weak spots. But you can lower the pressure forces that push tissue through vulnerable areas. Treating chronic constipation reduces repeated straining. Quitting smoking eliminates the chronic cough that weakens abdominal muscles over time. Maintaining a healthy weight keeps baseline abdominal pressure lower.
Core strengthening helps keep the muscles surrounding your abdomen and groin strong and elastic. Simple exercises like planks build this stability without requiring equipment. When it comes to lifting, whether at work or in the gym, the key principles are straightforward: bend at the knees rather than the waist, keep your back straight, lift with your legs, and don’t rush. If a load feels too heavy, get help or use equipment. For athletic lifting, warming up with lighter weights before progressing to heavy loads gives your muscles time to prepare. If you feel pain during a lift, stop.