Why Is a Spigelian Hernia So Hard to Find?

Last updated: 04-Oct-2026

Dr Harsh Shah, robotic and gastrointestinal surgeon, Ahmedabad

Dr Harsh Shah

MS, MCh (Surgical Gastroenterology), DrNB (Surgical Gastroenterology)
Registered with Gujarat Medical Council, Reg. No. G-38738
Robotic Hernia Surgeon  ·  Apollo Hospital, Bhat, Gandhinagar  ·  Gota OPD, Ahmedabad

4.9 200+ Google reviews

In short

  • A Spigelian hernia forms at the side of the lower belly, at the outer edge of the straight belly muscle.
  • It often hides under a firm layer of muscle. So it may cause pain or a dragging feeling without any visible lump.
  • An ultrasound done while you strain, or a CT scan, usually finds it. Planned repair is advised because the opening is narrow.

Most hernias show as a lump you can see and feel. A Spigelian hernia often does not. People may have pain at the side of the belly for months before anyone finds the cause.

This page explains where it hides, how it is found and why repair is advised.

Where a Spigelian hernia forms

The straight belly muscle runs down each side of the navel. Along its outer edge there is a band of tissue where other muscle layers join. A weak spot in this band, low down near the belly button level or below, lets fat or bowel push through.

It is uncommon. It is seen more in people over 50, and after weight gain, pregnancy or earlier surgery.

Why there is often no lump

The outer layer of muscle over this spot is firm. So the hernia often spreads in between the muscle layers rather than pushing out under the skin. You feel it, but you do not see it.

The pain may come on with lifting, coughing or standing for long, and ease when you lie down. In a person with some weight, even a doctor may not feel it.

How it differs from more common hernias

How a Spigelian hernia differs from more common hernias

PointSpigelian herniaInguinal or umbilical hernia
WhereSide of the lower bellyGroin, or at the belly button
Visible lumpOften noneUsually easy to see
Main complaintPain or a dragging feelingA lump that comes and goes
How it is foundUltrasound while straining, or CTOften by examination alone
Usual advicePlanned repair once foundRepair, or watch if small and not painful

Pain at the side of your lower belly with no clear cause? Bring any ultrasound or CT report you have.

How it is found

  1. The doctor examines the side of your belly standing and lying down, and asks you to cough or tense the belly.
  2. An ultrasound is done while you strain, so the hernia shows itself.
  3. If the ultrasound is unclear, a CT scan of the belly wall gives a fuller picture.

Warning signs that need help the same day

Warning signs that need help the same day

  • Pain at the side of the belly that becomes severe and constant.
  • A tender lump appears and will not go back.
  • You start vomiting or your belly swells.
  • You cannot pass gas or stool.

Go to an emergency department if these happen.

Why repair is advised

The opening of a Spigelian hernia is usually small with firm edges. Bowel that slips in can get stuck. So surgeons advise a planned repair once it is found, even if the pain is mild.

Keyhole or robotic repair lets the surgeon see the weak spot from inside and cover it with a mesh. Most people go home the same day or the next day.

Frequently asked questions

Where is a Spigelian hernia?

It is on the side of the lower belly, a little below and to the side of the navel, along the outer edge of the straight belly muscle.

Why can I feel pain but not see a lump?

The hernia often stays under a firm outer layer of muscle. It pushes in between the muscles instead of out under the skin.

Which scan finds a Spigelian hernia?

An ultrasound done while you strain or cough often finds it. A CT scan helps when the picture is still unclear.

Does a Spigelian hernia need surgery?

Usually yes. The opening is small with firm edges, so bowel can get trapped. Surgeons advise planned repair once it is found.

How is a Spigelian hernia repaired?

The contents are put back and the gap is closed, usually with a mesh. Keyhole or robotic repair lets the surgeon see it from inside.

Related pages

Where to find us

Dr Harsh Shah, MS, MCh (Surgical Gastroenterology), DrNB (Surgical Gastroenterology)
Shah's Gastro, Cancer & Robotic Surgery Centre
Apollo Hospital, Bhat, Gandhinagar
Gota OPD, Ahmedabad
Bring your reports. Second opinions are welcome.

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