The most common sign of a hernia is a visible bulge under the skin, typically in the groin, belly button, or abdomen. This bulge often appears or becomes more noticeable when you stand up, cough, or strain, and it may flatten or disappear when you lie down. But not all hernias produce a visible lump. Some cause only pain, pressure, or digestive symptoms depending on where they occur.
The Telltale Bulge
A soft, protruding lump is the hallmark of most hernias. It shows up because tissue or part of the intestine is pushing through a weak spot in the surrounding muscle wall. You’ll usually notice it more during activities that increase pressure in your abdomen: lifting something heavy, coughing, standing for long periods, or straining during a bowel movement. When you relax or lie flat, the bulge often shrinks or goes away entirely because the tissue slides back into place.
The location of the bulge tells you a lot about the type of hernia. Inguinal hernias, the most common kind, appear in the groin area on one or both sides. In men, the bulge sometimes extends down into the scrotum. Umbilical hernias create a bulge at or near the belly button. Ventral or incisional hernias show up along the front of the abdomen, often at the site of a previous surgery. Femoral hernias appear just below the groin crease, closer to the upper thigh.
Not every lump in the groin is a hernia. Swollen lymph nodes can also cause bumps in that area, but they tend to feel firm or rubbery, are usually not reducible (meaning they don’t push back in when you press on them), and may appear on both sides. A hernia bulge, by contrast, is soft, changes size with activity, and sits above the crease of the groin in the case of an inguinal hernia or just below it for a femoral hernia.
What the Pain Feels Like
Hernia pain varies depending on the type and location, but it rarely starts as sharp or severe. Most people describe a dull ache, a sense of pressure, or a dragging, heavy feeling at the site. In men with inguinal hernias, this can include a tugging sensation in the scrotum near the testicles. Women with the same type of hernia more often report aching or sharp pain along with a burning sensation in the groin.
The key pattern is that hernia discomfort gets worse with physical activity and better with rest. Heavy lifting, running, pushing, prolonged standing, and straining during bowel movements all tend to intensify the pain. Lying down and relaxing generally brings relief. Some people notice the discomfort builds throughout the day and is worst by evening, especially if they’ve been on their feet.
It’s worth noting that some hernias cause no pain at all, particularly in the early stages. You might only notice a slight bulge or an occasional twinge. The absence of pain doesn’t mean the hernia is harmless, as it can still grow over time.
Signs of a Hiatal Hernia
Hiatal hernias are different because they happen inside the body, where part of the stomach pushes up through the diaphragm into the chest cavity. There’s no visible bulge. Instead, the symptoms overlap heavily with acid reflux: heartburn, regurgitation of food or liquid into the mouth, trouble swallowing, and chest or upper abdominal pain. Many small hiatal hernias cause no symptoms at all and are discovered incidentally during imaging for something else.
If you’ve been dealing with persistent heartburn or a sour taste in your mouth after meals, a hiatal hernia is one possible cause. The stomach’s new position makes it easier for acid to flow backward into the esophagus, which creates that burning sensation behind the breastbone.
Signs in Babies and Children
Umbilical hernias are common in infants, and the most obvious sign is a bulging belly button. The bulge typically comes and goes. It becomes more visible when the baby is crying, straining, or coughing, then flattens when the child is calm and relaxed. As the hernia grows, it can stretch the overlying skin noticeably.
Most umbilical hernias in children close on their own by age 4 or 5 and don’t cause pain. In rare cases, however, the tissue inside the hernia can become trapped. If that happens, the bulge stays visible even when your child is relaxed and calm. The belly button area may become very tender to touch and appear red or discolored. Your child may also develop a fever, vomit, or refuse to eat. These are signs that need immediate medical attention.
Warning Signs of a Strangulated Hernia
Most hernias are not emergencies, but strangulation is. This happens when the blood supply to the tissue trapped inside the hernia gets cut off. A strangulated hernia is a surgical emergency, and the signs are distinct from everyday hernia discomfort:
- Sudden, severe pain that escalates quickly, unlike the usual mild ache
- Skin color changes over the bulge, turning red, purple, or dark
- Nausea and vomiting
- Fever
- Inability to pass gas or have a bowel movement
- A bulge that won’t flatten when you lie down or gently press on it
If you notice any combination of these symptoms, especially a hernia bulge that changes color or pain that comes on suddenly and worsens fast, you need emergency care. Tissue deprived of blood flow can die within hours.
How Hernias Are Diagnosed
In many cases, a hernia can be diagnosed with a physical exam alone. Your doctor will look for a bulge while you’re standing and then ask you to cough or bear down. The cough increases pressure inside your abdomen, which pushes the hernia outward and makes it easier to feel. If the doctor detects a bulge or an impulse against their fingers during the cough, that confirms the hernia. For women, the exam involves pressing with an open hand over the groin to feel for the same impulse.
When the hernia isn’t obvious on exam, or when your doctor suspects an internal hernia like a hiatal hernia, imaging comes next. A CT scan is particularly effective for complex or internal hernias because it produces detailed cross-sectional images that show exactly where the tissue is pushing through. An MRI may be used when precise anatomical detail is needed for surgical planning. Ultrasound can also detect hernias but is more commonly a first-line tool for straightforward cases.
Symptoms That Are Easy to Miss
Not every hernia announces itself with a noticeable lump. Some people experience only vague discomfort in the groin, a feeling of heaviness in the lower abdomen, or pain that seems to radiate into the inner thigh. Women in particular may have inguinal hernias misdiagnosed as ovarian cysts, endometriosis, or other pelvic conditions because the hernia can be small and deep enough to avoid detection on a standard exam.
Another easily overlooked sign is a change in bowel habits or a feeling of fullness or bloating, which can occur when a loop of intestine is partially involved. Pain during exercise that resolves completely with rest is another pattern worth paying attention to, especially if it’s consistently on one side of the groin. These subtler signs still point to the same underlying problem: a weak spot in the muscle wall that’s allowing tissue to push through.