The most common sign of a hernia is a visible bulge or swelling that appears when you stand, cough, or strain, and shrinks or disappears when you lie down. Not all hernias produce a bulge you can see, though. Some cause pain, burning, or pressure without an obvious lump, and one common type (hiatal hernia) happens entirely inside your body with no external signs at all. Knowing what to look for depends on where the hernia occurs.
The Telltale Bulge
Most hernias push tissue through a weak spot in your abdominal wall, creating a soft lump you can see or feel. The bulge typically shows up in your groin, at your navel, or along a previous surgical incision. It becomes more noticeable when you’re upright, lifting something heavy, coughing, or straining during a bowel movement. When you lie down and relax, the bulge often slides back inside on its own or can be gently pushed flat.
This in-and-out behavior is one of the clearest ways to distinguish a hernia from other types of lumps. Swollen lymph nodes, cysts, and fatty tissue growths don’t change size when you shift positions. A hernia does. If you notice a lump in your groin that disappears when you’re in bed but pops out again when you stand up, that pattern alone is a strong indicator.
Groin Hernias: The Most Common Type
Inguinal hernias account for the vast majority of hernias and occur far more often in men. The inguinal canal, the passageway in the groin where the spermatic cord runs, is wider and shorter in men than in women, creating a natural weak point. Women make up roughly 9% of inguinal hernia repairs but have a much higher rate of femoral hernias, which occur slightly lower in the groin, near the crease of the thigh. The female-to-male ratio for femoral hernias is approximately 10 to 1.
Symptoms of a groin hernia include:
- A bulge in the groin or scrotum that appears with activity and recedes with rest
- A dull ache or heaviness in the groin, especially after standing for long periods
- Burning or pressure at the site of the bulge
- Discomfort that worsens when you lift, cough, bend over, or exercise
Some groin hernias cause no pain at all. You might notice the bulge during a shower or while getting dressed and feel perfectly fine otherwise. Pain-free hernias are still real hernias, and current guidelines consider both watchful waiting and early surgical repair as reasonable options for hernias that aren’t causing complications.
Hernias at the Navel or a Surgical Scar
Umbilical hernias create a soft swelling right at or near the bellybutton. They’re extremely common in newborns, where you’ll see the navel push outward when the baby cries, coughs, or strains. In infants, these are usually painless and often close on their own by age 3 or 4.
Adults can develop umbilical hernias too, particularly during pregnancy, after significant weight gain, or with repeated heavy lifting. Unlike the childhood version, adult umbilical hernias tend to cause abdominal discomfort and don’t resolve without treatment. A bulge near your navel that you can push in but keeps returning is the hallmark sign.
Incisional hernias develop at the site of a previous abdominal surgery. The scar tissue never becomes as strong as the original muscle wall, and over time, tissue can push through. These feel similar to other hernias: a bulge along or near the surgical scar that becomes more prominent with activity.
Hiatal Hernias: No Visible Bulge
A hiatal hernia is different from every other type because it happens inside your chest cavity, where part of the stomach pushes upward through the diaphragm. There’s nothing to see or feel on the outside of your body. Most people discover they have one only after seeking help for persistent acid reflux symptoms.
Signs that point toward a hiatal hernia include chronic heartburn, difficulty swallowing, a dry cough, bad breath, nausea, and the gradual wearing away of tooth enamel from repeated acid exposure. Many hiatal hernias cause no symptoms at all and are found incidentally during imaging for another issue. If you’ve been dealing with heartburn that doesn’t respond well to dietary changes or over-the-counter antacids, a hiatal hernia could be the underlying cause.
The Cough Test You Can Try at Home
A simple self-check can help you identify a groin hernia. Stand in front of a mirror and place your fingers over your groin crease, roughly where your thigh meets your lower abdomen. Now cough or bear down as if you’re having a bowel movement. If a hernia is present, you’ll feel a bulge push against your fingertips or see one appear in the mirror. This is essentially the same test a doctor performs during a physical exam: standing and coughing makes a hernia more prominent because the effort increases pressure inside your abdomen, forcing tissue outward through the weak spot.
This test works well for groin hernias but won’t detect a hiatal hernia or a small hernia that hasn’t developed enough to produce a noticeable bulge yet. A negative result doesn’t guarantee you’re hernia-free, especially if you’re experiencing unexplained groin pain or pressure.
Other Conditions That Look Similar
Not every lump in the groin is a hernia. Several other conditions can produce swelling in the same area, and telling them apart matters for getting the right treatment.
Swollen lymph nodes are one of the most common mimics. They tend to feel firm and fixed in place rather than soft and reducible. They don’t change size when you stand up or lie down, and they’re often accompanied by signs of infection like redness, warmth, or tenderness in the surrounding skin. An undescended testicle, which affects about 1 in 100 males into adulthood, can also be felt as a lump in the inguinal canal.
A saphena varix, which is a varicose vein near the top of the thigh, can mimic a femoral hernia convincingly. It disappears when you lie flat and feels soft, much like a hernia. The distinguishing feature is a buzzing sensation (a “thrill”) you can feel over the lump when you cough. If you’ve had previous groin surgery, scar tissue or fluid collections from the procedure can also create lumps that resemble a new hernia.
How Hernias Are Confirmed
Many hernias can be diagnosed through a physical exam alone. A doctor will ask you to stand and cough while they feel for a bulge, and this is often enough to confirm the diagnosis. When the exam is inconclusive, or when your symptoms suggest a hernia that can’t be felt from the outside, imaging is the next step.
Ultrasound is typically the first imaging test ordered for groin and abdominal wall hernias because it’s quick, painless, and doesn’t involve radiation. CT scans provide more detailed views and are particularly useful for hernias near surgical scars, deep in the pelvis, or involving the diaphragm. MRI is sometimes used when other imaging is unclear, especially for groin hernias that are difficult to classify.
Warning Signs That Need Immediate Attention
Most hernias develop gradually and cause manageable discomfort. The danger comes when a hernia becomes trapped (incarcerated) and its blood supply gets cut off (strangulated). This is a surgical emergency.
The signs are hard to miss: sudden, severe pain at the hernia site that keeps getting worse and doesn’t improve with rest or repositioning. Nausea and vomiting often follow. The skin over the bulge may change color, starting paler than usual and then turning darker or reddish. The bulge becomes hard and tender, and you can no longer push it back in. If you experience this combination of symptoms, call emergency services. A strangulated hernia requires urgent surgery because the trapped tissue begins to die without blood flow.
In infants with umbilical hernias, the same red flags apply: pain, vomiting, or discoloration at the site of the bulge all warrant immediate medical evaluation.