A hernia is a bulge that forms when an internal organ or tissue pushes through a weak spot in the muscle or connective tissue that normally holds it in place. Most commonly, this means part of the intestine or fatty tissue protrudes through the abdominal wall. Hernias are extremely common: roughly 1 in 4 men and 1 in 50 women will need surgery for a groin hernia at some point in their lives, and over a million hernia repairs are performed in the United States each year.
How a Hernia Forms
Your abdominal wall is made up of layers of muscle and tough connective tissue that act like a retaining wall for your organs. A hernia develops when that wall has a weak point, either one you were born with or one that developed over time. Pressure from inside your abdomen then pushes tissue or part of an organ through that gap, creating a bulge you can often see and feel under the skin.
Several things increase that internal pressure or weaken the wall itself. Chronic coughing, straining during bowel movements, heavy lifting, pregnancy, and excess body weight all raise the force pushing against your abdominal wall. Aging naturally weakens connective tissue, and previous abdominal surgery creates scar tissue that may not hold as firmly as the original muscle. Some people are simply born with a wider natural opening in the groin or around the belly button, which makes herniation more likely from the start.
Common Types of Hernias
Hernias are named for where they occur, and the location determines both the symptoms and the approach to treatment.
- Inguinal hernia: The most common type by far, accounting for about 75% of all hernias. Part of the bowel pushes into the inguinal canal, a passageway that runs through the lower abdomen toward the inner thigh. These mostly affect men, partly because the inguinal canal is the path the testicles descend through before birth, leaving a natural weak spot.
- Femoral hernia: A less common groin hernia that occurs just below the inguinal canal, in the femoral canal near the upper thigh. Fatty tissue typically pokes through. These are more frequent in women.
- Umbilical hernia: Occurs near the belly button, where intestine or fatty tissue pushes through an opening in the abdominal wall. Most are congenital (present from birth) and often close on their own in children. In adults, they usually contain fatty tissue rather than intestine.
- Incisional hernia: Develops at the site of a previous abdominal surgery, where the healed incision has weakened over time. It is a common side effect of abdominal operations.
- Hiatal hernia: Different from the others because it happens inside the body rather than creating a visible bulge. The top of the stomach pushes upward through the opening in the diaphragm where the esophagus passes through. This can weaken the valve between the stomach and esophagus, leading to acid reflux.
What a Hernia Feels Like
The classic sign is a visible bulge, often in the groin or near the belly button, that becomes more obvious when you stand up, cough, or strain. You may notice it disappears or flattens when you lie down. Along with the bulge, many people feel a burning or aching sensation at the site, and pressure or discomfort that gets worse when bending over, coughing, or lifting something heavy. In men, a groin hernia can sometimes cause pain and swelling around the testicles if the protruding tissue descends into the scrotum.
Not all hernias cause symptoms. Some are discovered during a routine physical exam, and minimally symptomatic hernias are common enough that “watchful waiting” is a recognized option (more on that below). Hiatal hernias, in particular, often produce no symptoms at all. When they do, the signs are different from external hernias: heartburn, regurgitation, difficulty swallowing, chest pain, feeling full quickly after eating, or shortness of breath. Larger hiatal hernias are more likely to cause these problems.
When a Hernia Becomes an Emergency
Most hernias are not dangerous on their own, but they carry a risk of two serious complications. An incarcerated hernia means the tissue has gotten trapped in the abdominal wall and can no longer be pushed back in. Blood still flows to the trapped tissue, but the situation can worsen. A strangulated hernia is the more dangerous progression: the blood supply to the trapped tissue gets cut off, and the tissue can begin to die in as little as four hours.
Signs that a hernia may be 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 reddish, pale, or darker than usual). This is a medical emergency requiring immediate surgery.
Surgical Repair: Open vs. Laparoscopic
Surgery is the only way to fix a hernia. The tissue won’t go back into place permanently on its own, and the opening in the muscle wall won’t close without intervention. There are two main surgical approaches.
Open repair involves a single incision over the hernia site. The surgeon pushes the protruding tissue back into place and reinforces the weak spot, typically with a piece of synthetic mesh made of polypropylene. This mesh acts like a patch, providing a scaffold that the body’s own tissue grows into over time. The standard technique for groin hernias, known as the Lichtenstein repair, places this mesh between layers of the abdominal wall muscle.
Laparoscopic (keyhole) repair uses several small incisions and a camera. The mesh is placed behind the abdominal wall from the inside. This approach takes longer in the operating room. For a single-sided groin hernia, laparoscopic surgery averages about 84 minutes compared to roughly 47 minutes for open repair. But the tradeoff comes afterward: patients report less postoperative discomfort at one and four weeks, and they return to normal activities in about 7 days compared to roughly 14 days with open surgery. Hospital stays are slightly shorter as well, averaging about 2 days for laparoscopic versus just over 2 days for open repair.
Both approaches have high success rates, and the choice often depends on the hernia’s size and location, whether it’s a first-time or recurring hernia, and the surgeon’s expertise.
Recovery After Surgery
There are no universal, evidence-based guidelines on exactly how long to avoid lifting after hernia surgery, which is why recommendations vary between surgeons. That said, expert consensus offers a useful framework. After a laparoscopic groin hernia repair, most surgeons recommend avoiding physical strain for about 2 weeks, at which point a return to full activity, including sports and heavy physical work, is generally considered reasonable. After open repair or incisional hernia surgery, that timeline extends to about 4 weeks.
Complex hernia repairs may require longer recovery, though opinions vary. In the early days after any hernia surgery, you can expect some soreness and swelling at the incision sites. Most people can walk and handle light daily tasks right away but should avoid heavy lifting and intense exercise during the recovery window.
Watchful Waiting Without Surgery
If your hernia causes little or no pain, surgery may not be immediately necessary. A large randomized trial assigned men with minimally symptomatic inguinal hernias to either surgical repair or watchful waiting. Over an average follow-up of about 3 years, 23% of the men in the watchful waiting group eventually chose to have surgery, most commonly because hernia-related pain increased over time. The rest continued without complications.
Watchful waiting means monitoring for changes: increasing pain, a growing bulge, or any signs of incarceration or strangulation. It does not mean the hernia will heal on its own. It simply delays surgery until symptoms justify the procedure. For hernias that are already painful, large, or growing, repair is typically recommended without a waiting period.