Spigelian Hernia

What is Spigelian hernia?

A spigelian hernia is an uncommon type of abdominal wall hernia. A hernia is a bulge that forms when tissue inside the body, such as fat or part of the bowel, pushes through a weak spot in the surrounding muscle or connective tissue. In a spigelian hernia, that weak spot lies along a band of tissue called the spigelian fascia. Fascia is a strong, sheet-like layer of connective tissue that holds muscles together. The spigelian fascia runs on each side of the abdomen, roughly along a line between the outer edge of the long “six-pack” muscles (the rectus abdominis) and the flat side muscles of the belly.

Most spigelian hernias appear in a small zone below the level of the navel and above the hip bones, where the fascia is naturally thinner. What makes this hernia unusual is that the bulge often stays hidden beneath a layer of muscle (the external oblique) instead of pushing straight out under the skin. This is why a spigelian hernia is sometimes described as an interparietal hernia, meaning it sits between layers of the abdominal wall rather than on the surface.

Spigelian hernias account for a very small share of all abdominal hernias. They most often affect adults in middle age and older, and they can occur in people of any sex. Rarely, a spigelian hernia is present at birth or found in a child. Because the hernia is often concealed and may cause vague pain, it is frequently mistaken for other abdominal problems, and diagnosis can be delayed.

Spigelian hernia symptoms

The symptoms of a spigelian hernia can be subtle, especially early on, and they vary from person to person. Some people have no symptoms at all and the hernia is discovered by chance during imaging for another reason. Others notice a combination of the following:

• A dull ache, pressure, or intermittent pain on one side of the lower abdomen, usually below and to the side of the navel
• Pain that gets worse with coughing, straining, lifting, standing for long periods, or exercise, and improves when lying down
• A soft lump or bulge to one side of the belly that may come and go, and that may be easier to feel when standing or bearing down
• A feeling of something “catching” or moving in the abdominal wall
• Tenderness at a specific spot when the area is pressed
• Bloating, nausea, or a change in bowel habit if part of the bowel is involved

Reducible spigelian hernia. In many cases, the contents of the hernia slide back into the abdomen on their own or with gentle pressure. This is called a reducible hernia. Pain tends to be mild and comes and goes, and there may be no visible bulge because the hernia is hidden under muscle.

Incarcerated spigelian hernia. If tissue becomes trapped in the opening and can no longer slide back, the hernia is described as incarcerated. Pain becomes more constant, the lump may feel firm, and it cannot be pushed back in. Because the opening in a spigelian hernia is often small with firm edges, incarceration is thought to be more common than with some other hernia types.

Strangulated spigelian hernia. This is a medical emergency. Strangulation means the blood supply to the trapped tissue is cut off. It can cause severe, unrelenting pain, a hard and very tender lump, skin redness or darkening over the area, vomiting, fever, and an inability to pass stool or gas. Strangulated tissue can die within hours, so urgent surgical care is needed.

Spigelian hernia causes and risk factors

Doctors do not always find a single cause for a spigelian hernia. In most cases, it develops because the spigelian fascia has a natural area of weakness and something increases pressure inside the abdomen enough to push tissue through that gap. Recognized spigelian hernia causes and contributing factors include:

• Natural weakness of the fascia — the fibers of the spigelian fascia run in a way that leaves small gaps, especially in the lower abdomen, and these gaps may widen with age.
• Increased pressure inside the abdomen — from chronic coughing, repeated heavy lifting, straining during bowel movements, or difficulty passing urine.
• Weight gain and obesity — extra abdominal fat raises pressure on the abdominal wall and may stretch the fascia.
• Pregnancy — the growing uterus stretches and thins the abdominal wall, and repeated pregnancies may add to this effect.
• Previous abdominal surgery or injury — scars and healing tissue can create weak spots near the spigelian line.
• Rapid weight loss or muscle wasting — loss of muscle bulk may reduce support for the fascia.
• Fluid buildup in the abdomen (ascites) or long-term peritoneal dialysis, both of which increase internal pressure.
• Congenital factors — very rarely, a child is born with a gap in this area, sometimes linked with an undescended testicle in boys.

Other risk factors that may play a role include older age, smoking (which can weaken connective tissue and cause chronic coughing), chronic lung disease, and connective tissue disorders that affect the strength of fascia throughout the body. Having one of these factors does not mean a hernia will develop; it simply raises the chance.

Spigelian hernia diagnosis

A spigelian hernia diagnosis can be challenging because the bulge is often hidden beneath muscle, and the pain can mimic other conditions such as muscle strain, appendicitis, diverticulitis (inflammation of small pouches in the bowel wall), ovarian problems, or a kidney stone. Doctors usually combine a careful history, a physical examination, and imaging.

Medical history and physical examination. Your doctor will ask where the pain is, what makes it better or worse, and whether you have noticed a lump. During the exam, you may be asked to stand, cough, or tense your abdominal muscles so that any bulge becomes more prominent. The doctor may press along the spigelian line to look for a tender spot or a gap. In many people, particularly those who carry extra weight, the hernia cannot be felt at all, so a normal exam does not rule it out.

Ultrasound. An ultrasound scan uses sound waves to create pictures of the abdominal wall. It is often the first imaging test because it is painless, does not use radiation, and can be done while you are standing or straining, which may make a small hernia visible. The quality of the result depends on the skill of the operator and on body size.

CT scan. A computed tomography (CT) scan takes detailed cross-sectional X-ray images. It is considered the most reliable test for confirming a spigelian hernia, showing the exact location of the defect, what is inside the sac (fat, bowel, or other tissue), and whether there are signs of trapping or bowel blockage. CT is especially useful when symptoms are unclear or when an emergency such as strangulation is suspected.

MRI. Magnetic resonance imaging (MRI) may be used in some cases, for example in people who should avoid radiation or when a CT result is inconclusive.

Diagnostic laparoscopy. Occasionally, if imaging does not settle the question but symptoms strongly suggest a hernia, a surgeon may look inside the abdomen with a thin camera through a small incision. If a hernia is found, it can often be repaired during the same procedure.

Blood tests do not diagnose a hernia, but they may be ordered to check for infection or other causes of abdominal pain when the picture is not clear. At Acibadem, spigelian hernias are evaluated and managed by the General Surgery department, often working with radiology for imaging.

Spigelian hernia treatment options

Unlike some small hernias that can be safely watched for years, a spigelian hernia is generally treated with surgery once it is diagnosed, even if symptoms are mild. This is because the opening in the fascia tends to be narrow with firm edges, which raises the risk that bowel or fat becomes trapped and strangulated. Your surgeon will discuss the options that fit your health, the size of the hernia, and whether it is causing complications.

Watchful waiting. Observation without surgery may be considered in a small number of situations, for example when a hernia is found by chance, contains only fat, causes no symptoms, and the person has serious health conditions that make surgery risky. Even then, the person is usually taught the warning signs of trapping and reviewed regularly. A truss or support garment is not considered a reliable treatment for this hernia type because the defect lies deep under muscle.

Medication. There is no medicine that repairs a hernia. Over-the-counter pain relievers may ease discomfort while awaiting surgery, and treating contributing problems such as chronic cough or constipation can reduce strain. Medication does not remove the need for repair.

Open surgical repair. The surgeon makes an incision over the hernia, returns the contents to the abdomen, and closes the gap in the fascia with stitches. In many cases a piece of surgical mesh (a soft, flexible synthetic material) is placed to reinforce the area and lower the chance that the hernia returns. Open repair is often chosen when the hernia is large, when the exact position is well defined, or in emergency situations where bowel needs to be examined closely.

Laparoscopic (keyhole) repair. The surgeon works through several small incisions using a camera and thin instruments, placing mesh over the defect from inside the abdomen or between the layers of the abdominal wall. Keyhole surgery may allow the surgeon to confirm the diagnosis, check both sides for hidden hernias, and generally leads to smaller scars and a quicker return to normal activity for many people. Not everyone is a suitable candidate, especially those with extensive previous abdominal surgery.

Robot-assisted repair. Some centers use robotic instruments controlled by the surgeon to perform a keyhole repair. The principles are the same as laparoscopic surgery; the choice depends on surgeon experience and available equipment.

Emergency surgery. If the hernia is incarcerated or strangulated, surgery is performed urgently. If part of the bowel has lost its blood supply and cannot recover, that section may need to be removed and the healthy ends rejoined.

Recovery and rehabilitation. Most people go home the same day or after a short hospital stay. Discomfort is common for one to two weeks and is usually managed with simple pain relief. Your care team will advise you on wound care, when to shower, and how to gradually increase activity. Heavy lifting and strenuous exercise are typically limited for several weeks so the repair can heal. Walking is encouraged early because it helps recovery and lowers the risk of blood clots.

Living with spigelian hernia and outlook

For most people, the outlook after a spigelian hernia repair is good. Once the defect is closed and reinforced, symptoms such as pain and the sense of a lump usually resolve, and the chance of the hernia returning is generally considered low, though no repair can be guaranteed to last forever. Recurrence is more likely in people who continue to place heavy strain on the abdominal wall, who smoke, or who have conditions that weaken connective tissue.

If you have been advised to wait before surgery, or you are living with an unrepaired hernia for medical reasons, some day-to-day measures may help lower strain on the abdominal wall:

• Avoid heavy lifting where possible, and use your legs rather than your abdominal muscles when you must lift
• Manage constipation with fluids, fiber, and activity to reduce straining
• Seek treatment for a persistent cough or difficulty urinating
• Work toward a healthy weight if your doctor recommends it
• Stop smoking, which supports both tissue strength and surgical healing

Persistent pain at the repair site after surgery occurs in a minority of people and is usually mild, but it should be discussed with your surgeon if it interferes with daily life. Because spigelian hernias are rare, long-term follow-up is not always needed after an uncomplicated repair; your surgeon will tell you what is appropriate in your case.

Frequently asked questions

Can a spigelian hernia heal on its own?

No. A gap in the fascia does not close by itself in adults, and a spigelian hernia will not disappear without treatment. Symptoms may vary from day to day, and the bulge may seem to come and go, but the underlying defect remains. Because this hernia type carries a meaningful risk of tissue becoming trapped, surgeons generally recommend planned repair rather than waiting.

What do spigelian hernia symptoms feel like?

Many people describe a dull, nagging ache or a sharp twinge on one side of the lower belly that worsens with coughing, lifting, or standing and eases when lying down. Some feel a soft lump that appears when they strain. Others have no obvious lump and only vague pain, which is why the condition is often confused with muscle strain or other abdominal problems. Sudden severe pain with a hard lump may signal a trapped hernia and needs urgent care.

Is a spigelian hernia dangerous?

A spigelian hernia is not usually dangerous in itself, but it carries a higher risk of incarceration and strangulation than some other hernias because the opening is often small and rigid. Strangulation cuts off blood supply to the trapped tissue and is a surgical emergency. This risk is the main reason doctors usually advise repair once the hernia is found, even when symptoms are mild.

How is a spigelian hernia diagnosed if there is no visible bulge?

When the hernia is hidden under muscle, doctors rely on imaging. Ultrasound performed while you stand or strain can often show the defect, and a CT scan is considered the most reliable way to confirm the diagnosis and show what is inside the hernia. If imaging is inconclusive but suspicion remains high, a surgeon may recommend a diagnostic laparoscopy, which allows direct viewing and, if needed, immediate repair.

What is the best spigelian hernia treatment?

Surgical repair is the standard treatment. Whether open or keyhole surgery is best depends on the size and location of the hernia, your overall health, previous operations, and surgeon expertise. Both approaches usually involve reinforcing the weak area with mesh. Non-surgical management is reserved for a small group of people in whom surgery is considered too risky, and it requires close monitoring.

What are the most common spigelian hernia causes?

The main cause is a natural weak area in the spigelian fascia combined with increased pressure inside the abdomen. Contributing factors include obesity, chronic coughing, straining from constipation or urinary problems, pregnancy, heavy lifting, previous abdominal surgery, and aging of connective tissue. In rare cases the weakness is present from birth.

How long is recovery after spigelian hernia surgery?

Recovery times vary. Many people return to light activities within a week or two and to full activity, including exercise and heavy lifting, over several weeks as advised by their surgeon. Keyhole repair often allows a somewhat faster recovery than open repair, though this is not true for everyone. Following wound-care and activity instructions helps protect the repair while it heals.

When to see a doctor

Make an appointment with a doctor if you notice a new lump or persistent pain on one side of your lower abdomen, especially if it worsens when you cough, lift, or stand. Early evaluation allows the hernia to be repaired in a planned way before complications develop.

Seek emergency medical care immediately if you have a known or suspected hernia and develop any of the following red-flag signs, which may indicate a trapped or strangulated hernia or a bowel blockage:

• Sudden, severe, or rapidly worsening abdominal pain
• A lump that has become hard, very tender, and cannot be pushed back in
• Redness, purple or dark discoloration of the skin over the lump
• Nausea or repeated vomiting
• Inability to pass stool or gas, or a swollen, tight abdomen
• Fever or chills together with abdominal pain
• Rapid heartbeat, faintness, or feeling generally very unwell

These symptoms can develop over a few hours, and delayed treatment increases the risk of serious harm. Do not eat or drink while waiting for assessment in case emergency surgery is needed.