A hernia is a bulge that forms when part of your insides pushes through a weak spot in the muscle or tissue that normally holds it in place. Most commonly, this means a section of intestine poking through the abdominal wall, though hernias can also develop in the upper stomach, groin, or around the belly button. They range from painless and barely noticeable to seriously dangerous, depending on where they form and whether blood flow gets cut off to the tissue that’s pushed through.
Common Types of Hernias
Hernias are named for where they occur in the body, and each type has a slightly different profile.
- Inguinal hernia: The most common type. Part of your bowel pushes into the inguinal canal, a passageway that runs down your inner thigh. These are far more frequent in men.
- Femoral hernia: A less common groin hernia that develops in the femoral canal, which sits just below the inguinal canal. More likely in women.
- Umbilical hernia: Part of the intestine pokes through an opening in the abdominal wall near the belly button. Common in newborns, but adults can develop them too.
- Hiatal hernia: The opening in your diaphragm widens, and the top of your stomach pushes up through it into your chest. This one causes acid reflux rather than a visible bulge.
Less common types include incisional hernias, which form along a previous surgical scar, and spigelian hernias, which develop along the side of the abdominal wall and can be difficult to detect without imaging.
What a Hernia Feels and Looks Like
The first sign is usually a small bulge in the lower abdomen or groin. You may only notice it when you stand up, cough, jump, or strain, and it often disappears when you lie down. Some hernias produce a dull ache or dragging sensation, especially after standing for a long time or lifting something heavy. Others cause no pain at all.
Hiatal hernias are the exception. Because they sit inside the chest cavity, there’s no visible lump. Instead, you might experience heartburn, difficulty swallowing, or chest discomfort after eating.
Not every hernia is obvious on a physical exam. Some are “occult,” meaning they cause groin or pelvic pain without any palpable bulge. These hidden hernias typically require imaging to confirm.
What Causes a Hernia
Hernias form when pressure inside your abdomen pushes against a spot in the muscle wall that’s too weak to hold. Sometimes the weak spot is something you’re born with, like an opening near the belly button that never fully closed. Other times it develops over the years from strain, injury, or surgery.
Factors that increase that internal pressure include chronic coughing (especially from smoking), long-lasting constipation that forces you to strain during bowel movements, heavy lifting, pregnancy, and spending many hours a day on your feet. Obesity adds sustained pressure to the abdominal wall. Any combination of a weak spot and repeated pressure raises your risk.
How Hernias Are Diagnosed
Most hernias are diagnosed during a physical exam. Your doctor will feel the area while you cough or bear down, which makes the bulge more prominent. When the hernia isn’t detectable by touch, imaging fills the gap.
Ultrasound is often the first choice for groin and abdominal wall hernias. When performed by specialists, ultrasound detects inguinal hernias with a sensitivity above 96% and catches femoral hernias at close to 98% sensitivity. For hernias deeper in the pelvis or along the abdominal wall, CT scans are more useful. A specialized prone CT protocol (lying face down) reaches about 96% accuracy for groin hernias. MRI is another strong option, correctly identifying hidden inguinal hernias in roughly 91% of cases.
Treatment: Surgery vs. Watchful Waiting
Not every hernia needs immediate surgery. For inguinal hernias that cause no symptoms or only mild discomfort, watchful waiting is a valid approach, particularly for older adults or people with other health conditions that make surgery riskier. The trade-off is that most people in this group eventually need repair anyway as the hernia grows or becomes more bothersome. The risk of a dangerous complication like strangulation while waiting is relatively low, and if surgery is delayed, it can still be performed safely later.
When surgery is the right call, two main approaches exist. Open repair involves a single incision over the hernia site and can often be done under local anesthesia. Laparoscopic repair uses several small incisions and a camera, requiring general anesthesia. Laparoscopic patients typically report less pain in the days after surgery and return to normal activities about a day sooner (four days versus five in one large comparison). Open repair, however, carries lower rates of serious intraoperative complications (1.9% versus 4.8%) and has historically shown lower recurrence rates.
The Role of Mesh
Most hernia repairs today use a piece of synthetic mesh to reinforce the weak spot. This is a significant improvement over the older technique of simply stitching the muscle closed. Data from the Danish Hernia Database shows that mesh repairs (the Lichtenstein technique) have a recurrence rate of about 3% over eight years, compared to 8% for non-mesh sutured repairs. Over a 15-year period in one regional study, the rate of repeat operations for recurrence steadily declined as mesh became standard practice.
What Recovery Looks Like
After open inguinal hernia surgery, most people take one to two weeks off work before feeling ready to go back. You can usually drive again once you’ve gone two days without needing prescription pain medication, which for many people is within the first week. Despite old advice about strict lifting restrictions, current guidance is more flexible: walking, climbing stairs, lifting, mowing the lawn, and exercise are all fine as soon as they don’t hurt. Pain is the guide. If an activity causes discomfort, ease off and try again in a few days. Returning to normal movement early tends to support recovery rather than hinder it.
When a Hernia Becomes an Emergency
The serious risk with any hernia is strangulation. This happens in two stages. First, the hernia gets trapped in the abdominal wall (called incarceration), meaning it can no longer be pushed back in. Blood still flows to the trapped tissue at this point. But if the surrounding muscles squeeze tightly enough to cut off that blood supply, the tissue starts to die. This is strangulation, and it requires emergency surgery.
Warning signs include sudden, severe pain in the abdomen or groin that doesn’t improve, nausea and vomiting, and color changes in the skin around the bulge. The skin may first look paler than usual, then turn reddish or darker. Any combination of these symptoms, especially pain that keeps getting worse, calls for immediate emergency care.