Hernias come in several distinct types, each named for where they occur in the body. The most common are inguinal (groin), umbilical (belly button), hiatal (upper stomach), and incisional (at a surgical scar), but rarer forms like femoral, epigastric, and Spigelian hernias also affect thousands of people each year. Understanding which type you’re dealing with matters because the risks, symptoms, and treatment outlook vary significantly.
Inguinal Hernias
Inguinal hernias occur in the groin area and are by far the most common type. The lifetime risk is about 32% for men and 3% for women, largely because of a natural weak spot in the male groin where the spermatic cord passes through the abdominal wall.
There are two subtypes. Indirect inguinal hernias follow the path of the inguinal canal, the same passage the testicles descend through before birth. Direct inguinal hernias push through a weak spot in the floor of the abdominal wall itself. Indirect hernias outnumber direct hernias roughly 2 to 1. From the outside, both look and feel similar: a bulge in the groin that becomes more noticeable when you stand, cough, or strain, and often disappears when you lie down.
Femoral Hernias
Femoral hernias also appear near the groin but sit lower, just below the crease where your leg meets your abdomen. They account for only 2% to 8% of all groin hernias, yet they carry outsized risk. About 50% of femoral hernias show up as emergencies because the opening they push through (the femoral canal) is small and rigid, making it easy for tissue to get trapped.
These hernias are more common in low-weight, elderly women with naturally wider femoral canals. Because of their high strangulation rate, femoral hernias are almost always repaired surgically even when symptoms are mild.
Umbilical Hernias
Umbilical hernias push through the abdominal wall at or near the belly button. In newborns, they’re extremely common and usually close on their own by age 4 or 5. In adults, they develop when sustained pressure stretches a natural weak point where the umbilical cord once attached.
The main risk factors are obesity, multiple pregnancies, and repeated heavy lifting. Anything that chronically raises pressure inside the abdomen can contribute. You’ll typically notice a soft bulge at your navel that gets larger when you cough or bear down. Small umbilical hernias in adults are often painless, but larger ones can cause aching or tenderness, especially with activity.
Hiatal Hernias
A hiatal hernia is different from the others on this list because it happens inside the body, where the stomach pushes upward through the opening in the diaphragm (the hiatus) that your esophagus passes through. You can’t see or feel a bulge from the outside.
The sliding type (Type I) accounts for up to 99% of hiatal hernias. In this form, the junction between your esophagus and stomach slides upward into your chest. Once the lower esophageal sphincter moves out of the abdomen and into the low-pressure environment of the chest cavity, it becomes a weaker barrier against stomach acid. That’s why hiatal hernias are so strongly linked to acid reflux. People with hiatal hernias also tend to have longer episodes of sphincter relaxation, particularly at night, which increases the total time acid sits against the esophageal lining.
Paraesophageal hernias (Types II through IV) make up the remaining 1%. In these, part of the stomach rolls up alongside the esophagus into the chest. Type IV, or giant hiatal hernia, is the rarest (about 0.1% of cases) and typically requires surgery because of the risk that a large portion of the stomach, or even other organs, can migrate into the chest cavity.
Incisional Hernias
Any time a surgeon cuts through the abdominal wall, the healed scar tissue is weaker than the original muscle. Roughly one third of patients who undergo abdominal surgery will develop an incisional hernia at the scar site. These hernias are most likely to appear within three to six months after the operation, though they can show up years later.
The bulge typically grows with coughing, straining, or standing for long periods. Factors that slow wound healing, like infection at the surgical site, obesity, diabetes, or resuming heavy physical activity too soon, all raise the risk. Incisional hernias tend to enlarge over time, so repair is generally recommended before they become more complex to fix.
Epigastric Hernias
Epigastric hernias develop in the upper middle portion of the abdomen, between the breastbone and the belly button. They push through small gaps in the connective tissue that runs down the center of your abdominal wall. Most are small, often less than half an inch (about 1 centimeter), roughly the length of a staple. Larger ones reach about 1.5 inches, or the size of a walnut.
Because they’re so small, epigastric hernias often contain only a tiny bit of fatty tissue rather than intestine. Many cause no symptoms at all and are discovered during an exam for something else. When they do cause symptoms, you’ll typically feel a tender spot or mild pain in the upper abdomen, especially when straining.
Spigelian Hernias
Spigelian hernias are uncommon and can be tricky to identify. They occur in the lower abdominal wall, typically 2 to 3 inches to the side of the belly button. Unlike most hernias, they often develop between layers of muscle rather than pushing all the way to the surface, which means the usual visible bulge may be subtle or absent entirely.
When a bulge does appear, it tends to show up when you stand and disappear when you lie down. Pain can be intermittent and sharp, especially during bowel movements or heavy lifting. Because Spigelian hernias are hidden within the muscle layers, they carry a higher risk of going undiagnosed until complications develop, including trapped tissue that causes waves of severe abdominal pain, nausea, vomiting, and constipation.
When a Hernia Becomes Dangerous
Most hernias are not emergencies, but any hernia can become one. The two escalating stages of danger are incarceration and strangulation. An incarcerated hernia means the tissue that has pushed through the opening is stuck and can’t be pushed back in. A strangulated hernia means the blood supply to that trapped tissue has been cut off, and the tissue begins to die.
Warning signs include a hernia bulge that suddenly becomes firm, tender, or discolored, along with nausea, vomiting, fever, or inability to pass gas or have a bowel movement. Strangulation is a surgical emergency. Femoral hernias carry the highest strangulation risk among common types, but it can happen with any hernia, including inguinal, umbilical, and incisional.
How Hernias Are Diagnosed
Most hernias are diagnosed with a physical exam alone. Your doctor will ask you to stand, cough, or bear down while they feel for a bulge. When a hernia is suspected but can’t be confirmed by touch (an “occult” hernia), imaging helps.
Ultrasound is the typical first step for groin hernias. Dynamic ultrasound, where you cough or strain during the scan, has sensitivity and specificity both around 96% for detecting groin hernias. It’s inexpensive, radiation-free, and widely available. CT scans are useful for more complex situations, like Spigelian hernias, where they achieve 100% sensitivity. For groin hernias that remain unclear after ultrasound, MRI offers the highest accuracy, with sensitivity of 91% and specificity of 92% for hernias that other imaging has missed.
Hiatal hernias are usually found during an upper endoscopy or a barium swallow X-ray, since they occur inside the body where physical exams and standard abdominal imaging won’t reveal them.