Hernias can occur in more than a dozen locations across the body, from the groin and belly button to the diaphragm, pelvic floor, and along old surgical scars. The groin is by far the most common site, but hernias develop anywhere a gap or weakness in muscle or connective tissue allows internal contents to push through. Here’s a location-by-location breakdown of where they happen and why.
The Groin: Inguinal and Femoral Hernias
The groin accounts for the vast majority of hernias. The inguinal canal, a short tunnel running through the lower abdominal wall just above the crease of the groin, is the primary weak point. This canal carries the spermatic cord in men and the round ligament of the uterus in women. It has two openings (called rings), and hernias can develop at either one, creating two distinct types.
An indirect inguinal hernia enters through the deeper, outer ring of the canal and travels downward along its length. In men, it can follow the path of the spermatic cord all the way into the scrotum. A direct inguinal hernia pushes through a weakened area of the abdominal wall closer to the inner ring, bulging more centrally. Indirect hernias can occur at any age and are sometimes present from birth, while direct hernias are acquired over time as tissues weaken.
Femoral hernias occur just below the inguinal canal, where the major blood vessels pass from the abdomen into the thigh. They’re far less common, making up only 2 to 4 percent of groin hernias, but they carry a higher risk of becoming trapped and cutting off blood supply to the herniated tissue. Women develop femoral hernias roughly ten times more often than men.
A simple way to distinguish these on exam: inguinal hernias bulge above the crease of the groin, while femoral hernias bulge below it.
The Belly Button and Midline
The umbilicus (belly button) is a natural weak spot where blood vessels once passed through the abdominal wall before birth. An umbilical hernia occurs when tissue pushes through a defect within about 3 centimeters above or below the navel. These are common in newborns and often close on their own, but they also develop in adults, particularly with obesity or pregnancy.
Epigastric hernias form along the midline of the abdomen between the belly button and the breastbone. This strip of connective tissue (the linea alba) can thin out or develop small gaps, allowing fat or other tissue to poke through. Epigastric hernias are usually small and may cause localized tenderness without an obvious bulge.
Surgical Scars: Incisional Hernias
Any time the abdominal wall is cut during surgery, the repaired tissue never regains its full original strength. Incisional hernias develop at or near the scar line, sometimes months or years later. They tend to enlarge progressively over time. Midline incisions carry the highest risk, but hernias can form along any abdominal surgical site.
Several factors raise the odds: emergency surgery (where wound closure may be less meticulous), surgical site infections that weaken healing tissue, obesity, and conditions that increase abdominal pressure during recovery like chronic coughing. Initially the hernia may be barely noticeable, appearing only when you strain or stand up, but most eventually become a visible and palpable bulge.
The Diaphragm: Hiatal Hernias
The diaphragm, the dome-shaped muscle separating your chest from your abdomen, has a natural opening (the hiatus) where the esophagus passes through to connect to the stomach. When this opening widens, part of the stomach can slide upward into the chest cavity.
In the most common form, called a sliding hiatal hernia, the junction between the esophagus and stomach moves up through the hiatus. This is the type most often linked to acid reflux. In the less common paraesophageal type, the stomach-esophagus junction stays in place, but a portion of the stomach pushes up alongside the esophagus. Paraesophageal hernias are more concerning because the displaced stomach can become twisted or lose its blood supply.
The Lateral Abdominal Wall: Spigelian Hernias
Spigelian hernias are rare and easy to miss. They occur along the outer edge of the vertical abdominal muscles, where the flat muscle layers of the side abdomen transition into connective tissue. This location is typically at or below the level of the belly button, along the lower third of the abdomen.
Because these hernias push through layers of tissue but may remain covered by the outermost muscle, they don’t always produce a visible bulge. Pain or tenderness along the side of the abdomen, especially with straining, is often the main clue. Imaging is frequently needed to confirm the diagnosis.
The Pelvic Floor: Perineal Hernias
The pelvic floor is a hammock of muscles supporting the bladder, rectum, and reproductive organs. When these muscles weaken, tissue can herniate downward into the perineum, the area between the genitals and anus. Primary perineal hernias from general pelvic floor weakness are uncommon. Most develop after major pelvic surgeries that remove the rectum, prostate, or other structures, leaving a gap in the muscular support. Organs that can herniate through include the bladder, small intestine, and the layer of fat that drapes over the intestines.
Other Rare Locations
Obturator hernias pass through a small opening in the pelvic bone (the obturator foramen) and are most common in thin, elderly women. They’re notoriously difficult to diagnose because there’s no external bulge. Instead, they may cause inner thigh pain or bowel obstruction that seems to come from nowhere.
Lumbar hernias develop in the lower back, through natural gaps in the muscular layers between the lowest rib and the top of the pelvis. Two specific triangular weak points on each side of the back are the usual sites. These are among the rarest of all hernias.
Internal hernias occur entirely inside the abdomen, with bowel slipping through a gap in the tissue that holds organs in place. These gaps can be natural anatomical openings or spaces created by previous surgery. They produce no external bulge at all and are typically discovered when they cause a bowel obstruction.
What Causes Hernias in All These Locations
Regardless of the specific site, the underlying mechanism is the same: a combination of a weak spot in the surrounding muscle or connective tissue and enough pressure to push contents through it. Some weak spots are present from birth. Others develop from aging, injury, or surgery.
The pressure side of the equation includes chronic coughing (particularly from smoking), straining during bowel movements from constipation, heavy lifting or prolonged standing, pregnancy, and obesity. These forces act on whichever weak point happens to exist, which is why hernias can show up in such varied locations. Globally, inguinal, femoral, and abdominal hernias affected an estimated 32.5 million people as of 2019, with older men carrying the highest burden overall.
How Location Affects Symptoms
Most hernias that occur near the body’s surface share a common presentation: a bulge that appears or enlarges when you cough, strain, or stand, and flattens when you lie down or push it back in. Groin hernias may cause a dragging or aching sensation that worsens through the day. Hiatal hernias, being internal, cause heartburn, difficulty swallowing, or a feeling of fullness after small meals rather than any visible lump.
The location also determines the risk profile. Femoral hernias and obturator hernias are more likely to become incarcerated (trapped) and strangulated (losing blood supply) because they pass through tight, rigid openings. Inguinal hernias, passing through more flexible tissue, are less likely to strangulate but can still do so. Any hernia that suddenly becomes painful, firm, and impossible to push back in needs urgent medical attention, regardless of where it is.