The most common sign of a hernia is a visible bulge or lump, usually in the groin or abdomen, that becomes more noticeable when you stand up, cough, or strain. But not all hernias produce a bulge you can see or feel. About one-third of inguinal hernias (the most common type) cause no symptoms at all and are only discovered during a routine exam or imaging for something else. Whether you’ve noticed a strange lump, an unexplained ache, or persistent heartburn, here’s how to tell what might be going on.
The Classic Sign: A Bulge That Changes
The hallmark of most external hernias is a soft lump that appears when pressure builds inside your abdomen and disappears, or at least shrinks, when you lie down. You’ll typically notice it on one side of your pubic bone (inguinal hernia), around your belly button (umbilical hernia), or along a surgical scar (incisional hernia). The bulge is usually most obvious when you’re standing, and you can often feel it by placing your hand flat over the area.
What makes this bulge different from other lumps is that it responds to position and pressure. Stand up, cough, or bear down, and it pushes outward. Lie flat and relax, and it often slides back in. That “now you see it, now you don’t” quality is one of the strongest clues that what you’re feeling is tissue pushing through a weak spot in the muscle wall rather than a cyst, fatty lump, or swollen lymph node.
What a Hernia Feels Like
Pain isn’t always part of the picture, but when it is, people commonly describe it as a burning or aching sensation right at the bulge. You might also feel a sense of heaviness, pressure, or a pulling feeling around the site, especially after prolonged standing, heavy lifting, or strenuous exercise. The discomfort tends to build throughout the day and ease when you’re off your feet.
Some hernias cause only a dull awareness that something isn’t right in the groin or lower abdomen without producing sharp pain. Others announce themselves during a specific moment, like straining to pick up something heavy, with a sudden tearing or popping sensation followed by a new lump. The range is wide, which is part of why hernias can be tricky to self-diagnose.
Hernias You Can’t See
Not every hernia pushes outward. A hiatal hernia occurs when part of the stomach slides upward through the diaphragm into the chest cavity. You won’t see or feel a bulge from the outside. Most people with a sliding hiatal hernia, which is the most common type, don’t feel the hernia itself. Those who do have symptoms usually experience chronic heartburn and acid reflux rather than a visible lump. If you’ve been dealing with persistent reflux that doesn’t respond well to antacids, a hiatal hernia could be the underlying cause.
Deeper pelvic hernias, like obturator or sciatic hernias, are also invisible from the surface. These are rare but can cause groin or pelvic pain without any palpable bulge, making them harder to diagnose without imaging.
What Makes Symptoms Worse
Certain everyday activities reliably aggravate hernia symptoms because they raise pressure inside your abdomen. Coughing, sneezing, laughing hard, straining during a bowel movement, and lifting heavy objects can all push the bulge outward and intensify pain. Standing for long stretches tends to make things worse, while lying down and resting typically brings relief. If you’ve noticed a pattern where a lump appears or discomfort flares during these activities and calms down when you stop, that pattern itself is a meaningful clue.
How to Check Yourself
Doctors use a simple approach you can partly replicate at home. Stand in front of a mirror and look at your groin and abdomen for any asymmetry or bulging. Then bear down as if you’re trying to have a bowel movement (this is called a Valsalva maneuver) and watch for a bulge that appears or becomes more prominent. Place your open hand flat over the groin area while you do this. You may feel a distinct impulse or outward push under your fingers.
This won’t catch every hernia. Some are too small to see or feel without a trained examiner, and internal hernias won’t show up at all this way. But if you do feel a new bulge that wasn’t there before, particularly one that responds to straining, that’s worth getting evaluated.
Lumps That Aren’t Hernias
Finding a lump in your groin or abdomen doesn’t automatically mean hernia. Several other conditions can mimic one.
- Lipomas and cysts are benign lumps that feel soft or firm but don’t change with position. A lipoma won’t disappear when you lie down the way a hernia often does.
- Swollen lymph nodes in the groin can feel like small, tender lumps, especially during an infection. They’re usually firmer and more fixed in place than a hernia.
- Diastasis recti is a separation of the abdominal muscles, common after pregnancy, that creates a football-shaped bulge along the midline when you strain or sit up. It looks like a hernia but involves stretched connective tissue rather than a hole that organs can push through.
- Endometriomas can form near a C-section scar. If you notice a tender lump near an old surgical scar that swells or becomes painful around your period, this is a possibility worth discussing with your doctor.
The key distinguishing feature is whether the lump changes with position and pressure. A hernia tends to come and go. Most other lumps stay put.
Hernias in Babies and Children
Umbilical hernias are common in newborns, appearing as a soft bulge near the belly button that pops out when the baby cries, coughs, or strains. They range in size from a pea to a small plum. Most close on their own, and surgery is generally considered only if the hernia hasn’t noticeably shrunk by age 2 or hasn’t disappeared by age 5.
Warning signs that need immediate attention in a child include pain or tenderness at the hernia site, swelling or discoloration of the skin around it, an inability to gently push the bulge back in, and vomiting or constipation. These can signal that tissue has become trapped.
How Doctors Confirm It
Many hernias are diagnosed through a physical exam alone. Your doctor will look at the area while you stand and ask you to cough or bear down while they feel for an impulse or bulge. For groin hernias, this involves the examiner placing a finger along the inguinal canal to detect tissue pushing through.
When the exam is inconclusive, or when a hernia is suspected but can’t be felt, imaging fills the gap. Ultrasound is often the first step for both abdominal wall and groin hernias because it’s quick and non-invasive. CT scans provide more detailed views and are commonly used for suspected hernias along surgical scars, in the diaphragm, or deep in the pelvis. MRI is particularly useful for groin and deep pelvic hernias when other imaging is unclear. Differentiating between types of groin hernias through physical exam alone can be difficult, which is one reason imaging is frequently part of the workup.
When a Hernia Becomes an Emergency
Most hernias are not emergencies, but a strangulated hernia is. This happens when the tissue pushing through the muscle wall gets trapped and its blood supply is cut off. The signs are distinct and hard to ignore: sudden, severe pain in the abdomen or groin that doesn’t let up and keeps getting worse, nausea and vomiting, and skin color changes around the bulge. The skin may first look paler than usual, then turn reddish or darker. If a hernia that you could previously push back in suddenly becomes firm, painful, and won’t go back, that’s a red flag. This situation requires emergency medical care because the trapped tissue can die without blood flow.