A hernia typically looks like a soft bulge or lump under the skin, most commonly in the groin, near the belly button, or along a surgical scar. The bulge appears when tissue or part of an organ pushes through a weak spot in the surrounding muscle wall. What makes a hernia visually distinctive is that the bulge often changes: it may pop out when you stand, cough, or strain, then flatten or disappear when you lie down or press on it gently.
Inguinal Hernias: The Groin Bulge
Inguinal hernias are the most common type, and they show up as a bulge in the groin, the crease between your lower abdomen and upper thigh. The lump is usually soft and rounded, and it becomes more obvious when you cough, lift something heavy, or stand for a long time. Lying down or resting often makes it shrink or vanish entirely. In men, the bulge can extend down into the scrotum, making one side appear noticeably larger than the other.
A femoral hernia looks similar but sits slightly lower on the body, appearing just below the groin crease rather than above it. Femoral hernias are more common in women and tend to be smaller, sometimes only the size of a grape. Because of their position, they can be easy to miss until they grow or become painful.
Umbilical Hernias: Bulge at the Belly Button
An umbilical hernia creates a soft swelling or bulge right at or near the navel. In adults, it often looks like the belly button is pushing outward, especially during physical effort. The skin over it usually looks normal in color and texture.
In infants, umbilical hernias are especially common and may only be visible when the baby cries, coughs, or strains. During a calm moment, the belly button may look completely normal, then suddenly protrude when the baby gets fussy. Most infant umbilical hernias close on their own by age 3 to 4 and don’t require treatment.
Incisional Hernias: Bulges Along Surgical Scars
If you’ve had abdominal surgery, a hernia can develop through the weakened tissue at the incision site. This type produces a bulge or lump near or directly along the surgical scar. Incisional hernias can appear months or even years after the original operation. The bulge is more noticeable when you stand up or engage your abdominal muscles and may flatten when you lie down. These hernias come in a wide range of sizes, from barely noticeable to quite large, depending on how much tissue is pushing through.
Hernias You Can’t See
Not all hernias produce a visible bulge. A hiatal hernia happens when the upper part of the stomach slides up through an opening in the diaphragm into the chest cavity. Unlike groin or abdominal hernias, you won’t see any lump from the outside. Instead, the main signs are internal: heartburn, acid reflux, difficulty swallowing, or chest discomfort. A hiatal hernia is only visible through diagnostic imaging, such as a video X-ray of the esophagus or an upper endoscopy using a small camera threaded down the throat.
How a Hernia Differs From Other Lumps
A lump in the groin or abdomen isn’t always a hernia. Knowing how hernias behave compared to other types of lumps can help you figure out what you’re dealing with.
- Hernia: Soft, may go away when you press on it or lie down, and tends to get worse when you cough or strain. It may or may not be painful.
- Lipoma: A smooth, rubbery, dome-shaped lump that moves easily under the skin. It doesn’t change with position or straining.
- Cyst: A fluid-filled sac under the skin that sometimes hurts. It stays the same size regardless of your body position.
- Swollen lymph node: Usually firm and tender, often appearing during an infection. It doesn’t change when you cough.
- Cancerous lump: Typically hard, irregularly shaped, and firmly fixed in place. It usually doesn’t move when pressed and is often painless.
The key giveaway for a hernia is that it’s position-dependent. A lump that appears and disappears based on whether you’re standing, lying down, or straining is behaving like a hernia, not like a cyst or lipoma.
How Hernias Change Over Time
Hernias don’t heal on their own in adults. They tend to enlarge over time, sometimes slowly over months or years, sometimes rapidly. A hernia that starts as a small, barely visible bump during heavy lifting can gradually become a constant, prominent bulge. The longer it goes without repair, the larger the opening in the muscle wall can become, allowing more tissue to push through.
Early on, many hernias are “reducible,” meaning you or a doctor can gently push the bulge back in. As a hernia grows, it may become harder to push back and stay out more of the time.
Warning Signs of a Dangerous Hernia
Most hernias are not emergencies, but a hernia that becomes trapped (incarcerated) or loses its blood supply (strangulated) is a medical emergency. The visual signs are distinct and progress quickly.
A hernia bulge that is suddenly much larger than before, firm to the touch, and won’t push back in has likely become trapped. If the trapped tissue loses blood flow, the skin around the bulge may change color. It often turns reddish first, then progresses to a darker shade, sometimes purplish or dusky. This color change, especially combined with severe pain, nausea, vomiting, or fever, signals that tissue is dying and requires emergency surgery.
The progression from normal skin color to pale, then darker than usual over the bulge is a red flag that should prompt an immediate call to emergency services.