A hernia happens when an internal organ or tissue pushes through a weak spot in the muscle or tissue wall that normally holds it in place. Most hernias occur in the abdomen, where part of the bowel or the membrane lining the abdominal cavity squeezes through a gap in the abdominal wall. From the outside, this typically looks like a visible bulge under the skin. Hernias are common: the lifetime risk of developing a groin hernia is about 27% for men and 3% for women.
How a Hernia Forms
Your abdominal wall is made of layers of muscle and connective tissue that hold your organs in place. When a section of that wall becomes weak or develops a gap, the pressure inside your abdomen can push tissue or part of an organ through the opening. The protruding tissue often forms a pouch, sometimes called a hernia sac, and internal organs like the bowel or stomach may slip into it.
This weakness can be something you’re born with, or it can develop over time. Factors that increase abdominal pressure make hernias more likely: chronic coughing, straining during bowel movements, heavy lifting, pregnancy, and excess body weight all put extra force on the abdominal wall. Previous abdominal surgery can also create a vulnerable spot where a hernia forms later.
Common Types of Hernias
- Inguinal hernia: The most common type, occurring in the groin area. These account for the large majority of hernias and are far more frequent in men.
- Umbilical hernia: Develops near the belly button, where the abdominal wall has a natural weak point. Common in newborns and in adults with obesity or who have been pregnant.
- Incisional hernia: Forms at the site of a previous surgical incision, where scar tissue may not be as strong as the original muscle.
- Hiatal hernia: Different from the others because it’s internal. Part of the stomach pushes up through the diaphragm into the chest cavity. This type often causes heartburn and acid reflux rather than a visible bulge.
- Femoral hernia: Appears in the upper thigh, just below the groin crease. More common in women and carries a higher risk of complications.
What a Hernia Feels Like
The telltale sign is a visible lump or bulge that appears during certain activities, like lifting, coughing, or straining, and goes back in when you lie down or push it gently. Some hernias cause no pain at all. Others produce pressure, a dull ache, or a sharp pinching sensation when the tissue pushes through the opening. The discomfort often gets worse as the day goes on or after long periods of standing.
Hiatal hernias don’t produce a visible bulge. Instead, you might experience frequent heartburn, difficulty swallowing, or a feeling of food coming back up into your throat.
How Hernias Are Diagnosed
A physical exam is usually all that’s needed. Your doctor will look and feel for a bulge in the affected area and will likely ask you to stand and cough, since this increases abdominal pressure and makes the hernia more prominent. If the hernia isn’t easy to see or feel, imaging such as an abdominal ultrasound, CT scan, or MRI can confirm the diagnosis.
Treatment and Repair Options
Not every hernia requires immediate surgery. Small hernias that cause no symptoms are sometimes monitored over time with a “watchful waiting” approach. But if a hernia is painful, growing, or causing symptoms like nausea and vomiting, surgical repair is typically the recommended treatment.
There are two main surgical approaches. Open repair involves a single incision near the hernia, through which the surgeon pushes the protruding tissue back into place and reinforces the weak area. Laparoscopic repair uses several small incisions and a camera to guide the repair from inside. Both approaches can be performed with or without surgical mesh, a medical device placed over the weak spot to provide extra support and reduce the chance of the hernia returning. Medical literature consistently shows that mesh lowers recurrence rates.
Recovery depends on the approach. After laparoscopic repair, most people can return to normal activities within a few days. Open repair typically takes about a week. With either method, you can expect some soreness for the first couple of days. It’s not unusual to feel more discomfort on the second or third day than on the first. Driving, walking, and sexual activity can resume once you feel ready, though heavy lifting and vigorous exercise should be avoided for several weeks.
When a Hernia Becomes an Emergency
Most hernias are not dangerous, but they can become serious if the protruding tissue gets trapped and its blood supply is cut off. This is called a strangulated hernia, and it is a medical emergency. Warning signs include sudden, severe pain in the abdomen or groin that keeps getting worse, nausea and vomiting, and skin color changes around the bulge. The skin may turn reddish or darker than usual, or it may first go pale and then darken. If you experience these symptoms, you need emergency medical care immediately, as the trapped tissue can die without blood flow.
A hernia that becomes trapped but still has blood flow is called an incarcerated hernia. The bulge won’t go back in when you lie down or gently push on it, and it can progress to strangulation. This is another situation that needs prompt medical attention, even if the pain is manageable at first.