Most hernias are diagnosed through a simple physical exam in a doctor’s office, often in just a few minutes. Your doctor will look for a visible bulge, feel the area, and ask you to cough or strain. If the diagnosis isn’t clear from the exam alone, imaging like ultrasound or CT can confirm what’s going on. The type of hernia and its location determine exactly which tests you’ll need.
What You Can Check at Home
A hernia typically creates a bump or lump you can both see and feel. It often appears when you’re standing, lifting, or straining, then disappears when you lie down or gently push it back in. The most common spots are the groin (inguinal hernia), the belly button (umbilical hernia), and along a previous surgical scar (incisional hernia).
Stand in front of a mirror and look for any unusual bulge in your groin or abdomen. Place your hand over the area and cough or bear down. If you feel something push outward against your fingers, that’s worth getting checked. Not every hernia is visible, though. Some cause only a dull ache or dragging sensation in the groin, especially after standing for a long time or lifting something heavy.
The Physical Exam
A doctor’s physical exam is the primary way hernias are diagnosed. For a suspected groin hernia, you’ll be asked to stand while the doctor inspects the area visually, then feels for a bulge. The classic “turn your head and cough” test works because coughing increases pressure inside your abdomen, which pushes hernia contents outward and makes even small hernias easier to detect. A hernia that produces a palpable impulse when you cough is called a “positive cough impulse,” and it’s one of the most reliable physical signs.
To distinguish between the two types of groin hernia (direct and indirect inguinal), the doctor checks where the bulge sits relative to a bony landmark on your pelvis called the pubic tubercle. Inguinal hernias sit above and toward the middle of this point. The doctor may also press on a specific spot in the groin, ask you to cough again, and watch whether the bulge reappears when pressure is released. This helps pinpoint where the weak spot is.
For abdominal wall hernias, the exam is more straightforward. The doctor will have you lie flat, then lift your head or do a partial sit-up. This tenses the abdominal muscles and makes any bulge along a scar or near the belly button more obvious.
When Imaging Is Needed
A physical exam is enough to diagnose most hernias. But when the exam is inconclusive, when the hernia is too small to feel, or when it’s in a location that’s hard to examine by hand, imaging fills in the gaps.
Ultrasound
Ultrasound is typically the first imaging test ordered for a suspected groin or abdominal wall hernia. It’s painless, quick, involves no radiation, and can be done while you cough or strain so the technician can watch the hernia move in real time. For groin hernias that are large enough to feel on exam, ultrasound catches them with about 96% sensitivity and 96% specificity. That means it rarely misses a hernia and rarely calls something a hernia when it isn’t one.
Ultrasound is less reliable for “occult” hernias, the ones too small to feel. In some studies, its ability to detect these hidden hernias drops significantly, with sensitivity as low as 29% in certain cases. So a normal ultrasound doesn’t always rule out a small hernia if your symptoms are suspicious.
CT Scan
A CT scan gives a detailed cross-sectional view of your abdomen and pelvis. It’s particularly useful for hernias in harder-to-reach locations, like deep pelvic hernias or diaphragmatic hernias, and for evaluating complications like bowel obstruction. CT achieves about 96% accuracy for diagnosing inguinal hernias overall. It’s also the go-to choice when a doctor suspects a strangulated hernia and needs to see exactly what’s happening inside before surgery.
For abdominal wall hernias (umbilical, incisional, or those along the side of the abdomen), both ultrasound and CT are considered appropriate first-line imaging options.
MRI
MRI is less commonly ordered but becomes valuable in specific situations. For groin hernias that remain a mystery after ultrasound, MRI of the pelvis can provide soft-tissue detail that other scans miss. It’s also the preferred option for deep pelvic hernias (obturator, sciatic, or perineal types) alongside CT. MRI avoids radiation, which matters if repeated imaging is needed.
Testing for Hiatal Hernias
Hiatal hernias are different from the types you can see or feel. They occur when part of the stomach pushes up through the diaphragm into the chest cavity, and they’re entirely internal. You won’t find a visible bulge. Instead, the main symptoms are heartburn, acid reflux, and difficulty swallowing.
Two tests are commonly used. The first is a barium swallow, where you drink a chalky liquid that coats the lining of your esophagus and stomach. X-rays taken immediately afterward reveal the outline of your upper digestive tract, making it easy to see if part of the stomach has slid upward through the diaphragm. The second is an upper endoscopy, where a thin, flexible tube with a camera is passed down your throat. This lets the doctor directly view the junction between your esophagus and stomach and check for inflammation caused by acid reflux. Many hiatal hernias are discovered incidentally during endoscopies done for other reasons.
Testing for Sports Hernias
A sports hernia (athletic pubalgia) doesn’t produce a visible bulge, which is why it’s notoriously difficult to diagnose. It involves a tear or strain in the soft tissue of the lower abdomen or groin, usually from repetitive twisting motions in sports like soccer, hockey, or tennis. In most cases, a standard physical exam won’t find anything obvious.
The key diagnostic maneuver is a resisted sit-up. Your doctor will ask you to do a sit-up or flex your torso while they apply resistance. If this reproduces your groin pain, it strongly suggests a sports hernia. MRI is the most useful imaging test here, as it can reveal tears in the muscles and tendons that other scans miss. A sports hernia may coexist with a traditional inguinal hernia, but the two are distinct injuries.
Conditions That Can Mimic a Hernia
Not every lump in the groin is a hernia. Swollen lymph nodes from infection, fluid-filled sacs around the testicle (hydroceles), enlarged veins (varicoceles), and lipomas (benign fatty lumps) can all produce similar-looking bumps. A hydrocele, for instance, creates swelling in the scrotum that might look like an inguinal hernia, but it transmits light when a flashlight is held against it (hernias don’t). Your doctor considers the location, whether the lump changes with coughing, and whether it can be pushed back in to tell these apart. Ultrasound resolves most ambiguous cases quickly.
Red Flags That Need Emergency Attention
A hernia that can’t be pushed back in is called incarcerated. If the trapped tissue loses its blood supply, it becomes strangulated, which is a surgical emergency. The warning signs are a bulge that suddenly becomes painful and won’t go back in, nausea and vomiting, severe abdominal or groin pain that keeps getting worse, and skin color changes over the bulge (redness that progresses to a darker discoloration). If the skin around the lump turns pale and then darker than normal, that signals tissue is losing blood flow and you need emergency care immediately.
In an emergency setting, CT is the primary diagnostic tool. It shows whether bowel is trapped, whether blood supply is compromised, and helps surgeons plan the repair. An abdominal X-ray may also be taken to check for signs of bowel obstruction.