A hernia typically looks like a soft bulge or lump pushing out from under the skin, most often in the groin, belly button, or along a previous surgical scar. The size can range from a marble to a grapefruit, and the bulge often changes throughout the day, becoming more prominent when you stand up, cough, or strain. Here’s how to recognize the different types and know when a hernia needs urgent attention.
The General Appearance of a Hernia
Most hernias share a few visual features. You’ll see a rounded or oval bulge beneath the skin that feels soft and squishy when you press on it. The skin over it usually looks normal in color and texture, at least in the early stages. What makes a hernia distinctive compared to other lumps is how it behaves: it tends to appear or grow larger when you’re upright, coughing, lifting something heavy, or bearing down, and it may flatten or disappear completely when you lie down and relax.
If you can gently push the bulge back inside your abdomen, that’s called a “reducible” hernia. The contents (usually fat or a loop of intestine) are sliding freely in and out through a weak spot in the muscle wall. Many hernias stay in this stage for months or years. Others gradually grow larger over time and eventually stop going back in on their own.
Inguinal Hernia: Groin and Scrotum
Inguinal hernias are the most common type and appear as a bulge in the groin, the crease between the lower abdomen and the upper thigh. The bulge sits on one or both sides of the pubic bone and becomes more obvious when you’re standing. You can usually feel it by placing your hand directly over the area. In men, the protruding tissue sometimes descends into the scrotum, causing visible swelling and occasionally pain around the testicle.
These hernias are far more common in men, but women get them too. In women the bulge tends to be smaller and sits higher in the groin fold, which can make it harder to spot visually. A related type, the femoral hernia, appears just below the groin crease near the upper thigh. Femoral hernias are often small and not easily felt on physical exam. Ultrasound catches about 90% of femoral hernias that aren’t detectable by touch alone, which is why imaging is sometimes needed when the bulge isn’t obvious but symptoms persist.
Umbilical Hernia: Near the Belly Button
An umbilical hernia creates a soft swelling at or just beside the navel. In adults, the bulge is often slightly off-center, giving the belly button a lopsided or crescent-shaped look. Small ones may only contain fatty tissue, while larger ones can hold loops of intestine and stretch the overlying skin until it becomes noticeably thin, sometimes even irritated or raw.
In babies, umbilical hernias are especially easy to recognize. The belly button pokes outward when the infant cries, coughs, or strains, then flattens when the baby is calm. This classic “outie” appearance during crying is the hallmark sign. Most infant umbilical hernias close on their own by age 3 to 4 without treatment.
Incisional Hernia: Along a Surgical Scar
If you’ve had abdominal surgery, a hernia can develop through the healed incision site. It appears as a localized swelling along part of the scar, though in some cases the entire length of the incision bulges outward. You may also see several smaller bulges scattered along the scar line. These hernias tend to grow steadily over time, and the skin covering them can become thin and fragile-looking. The bulge is typically most visible when you stand or tighten your abdominal muscles.
Hernias You Can’t See From the Outside
Not all hernias produce a visible bulge. A hiatal hernia, where part of the stomach pushes up through the diaphragm into the chest, is entirely internal. You won’t see or feel anything on your skin. Instead, it causes symptoms like heartburn, difficulty swallowing, or chest discomfort. Hiatal hernias are diagnosed through a barium swallow (where you drink a contrast liquid while X-rays are taken) or an endoscopy. On imaging, the hernia appears as a gas-filled pouch sitting behind the heart.
How the Bulge Changes Throughout the Day
One of the most useful ways to identify a hernia is to watch how it responds to position and pressure. A hernia bulge is typically flat or invisible when you wake up in the morning and lie still. As you get up, walk around, and go through daily activities, gravity and abdominal pressure push tissue into the weak spot, making the bulge grow. Coughing, sneezing, or straining during a bowel movement can make it pop out suddenly. Lying back down and gently pressing on it often pushes it back in.
This “now you see it, now you don’t” behavior is one of the clearest differences between a hernia and other lumps. A lipoma (benign fatty lump), for instance, stays the same size regardless of position. Swollen lymph nodes are tender and often come with fever or fatigue. A muscle strain causes pain with movement but doesn’t produce a bulge that appears and disappears. Diastasis recti, a separation of the abdominal muscles common after pregnancy, creates a ridge along the midline that only shows when you actively sit up or crunch, but there’s no distinct lump you can push back in.
What a Hernia Looks Like in an Emergency
A hernia that was once easy to push back in but suddenly won’t budge is called “incarcerated.” The tissue is trapped. Visually, the bulge looks firmer and more swollen than usual, and it may be tender to touch. This is a warning sign that things are progressing.
If the trapped tissue loses its blood supply, the hernia becomes “strangulated,” which is a surgical emergency. The visual changes at this stage are more dramatic. The skin over the bulge may turn red, then progress to purple or noticeably darker than the surrounding skin. The bulge itself often appears suddenly larger than before. Along with these color changes, you’ll likely feel severe pain, nausea, and vomiting. You may also stop passing gas or having bowel movements, which signals a bowel obstruction.
A hernia that turns red, purple, or dark and can’t be pushed back in needs emergency medical evaluation. The color change reflects compromised blood flow, and the tissue can die within hours if not surgically freed.
Conditions That Mimic a Hernia
Several other conditions can look similar at first glance. Knowing the differences can save you worry or, in some cases, prompt you to seek the right diagnosis sooner.
- Lipomas are soft, rubbery lumps under the skin that grow slowly and stay the same size whether you’re standing or lying down. They’re painless and don’t change with coughing.
- Swollen lymph nodes feel like small, movable lumps, usually in the groin or neck. They tend to be tender and often appear alongside infection symptoms like fever or fatigue.
- Testicular torsion causes sudden, severe scrotal pain and swelling that can be confused with an inguinal hernia. The pain is typically more intense and localized than hernia discomfort.
- Ovarian cysts can cause lower abdominal swelling, but the pain is usually sharp and internal rather than associated with a visible bulge on the surface.
The simplest distinguishing test you can do at home: lie down, relax, and gently press on the lump. If it softens and slides back inside, it’s very likely a hernia. If it stays put regardless of position and pressure, it’s probably something else.