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CION Cancer Clinics
Hernia at the nephrectomy incision | CION Cancer Clinics
A flank hernia after nephrectomy is a gap in the muscle under the scar that lets fat or bowel bulge out. It can appear months or years later. Most are not emergencies, but a hard, painful swelling with vomiting needs same-day care. This page explains why hernias form, how they differ from a slack muscle, how they are checked and when repair is considered. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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Medically reviewed by Dr. Mohammed ImaduddinConsultant Surgical Oncologist · MBBS, MS (General Surgery), MCh (Surgical Oncology) · last reviewed September 2026, next review due September 2027
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On this page
- What is a hernia at the nephrectomy scar?
- What raises the chance of a hernia after kidney surgery?
- How will the surgeon check whether it is a hernia?
- Does a hernia after nephrectomy always need another operation?
- What do families often get wrong about scar hernias?
- What can you do now, and what can this page not tell you?
- Common questions about hernias after kidney surgery
The short answer
What is a hernia at the nephrectomy scar?
A hernia at the scar is a gap in the muscle layer under the cut, through which fat or bowel pushes outwards as a soft swelling. It can appear weeks, months or even years after kidney surgery. It is usually not an emergency, but it does need a surgeon to look at it.
Why the side of the body is a weak spot
For an open kidney operation, the cut usually runs along the side of the belly or under the ribs. The surgeon has to go through three layers of muscle to reach the kidney. Those layers are stitched back together at the end, but stitched muscle takes many months to regain its strength. If one part of the repair gives way, a hernia forms. Keyhole surgery uses smaller cuts, so hernias are less common, but they can still appear at the cut where the kidney was taken out.
Not every bulge is a hernia
Many people notice their side looks fuller after a flank operation. Often this is not a hernia at all. A nerve that supplies the muscle was stretched or cut, so the muscle goes slack and bulges without any gap in it. Doctors call this a pseudohernia, meaning a false hernia. It looks similar, but it behaves differently and is handled differently.
Only an examination, and sometimes a scan, can tell the two apart. A photograph sent on WhatsApp cannot.Who is more likely to get one
What raises the chance of a hernia after kidney surgery?
Some of these you cannot change. Others are in your hands during the months of healing.
A wound that did not heal cleanly
An infection in the wound, or a wound that opened and had to heal from the bottom up, leaves the muscle repair weaker. This is one of the biggest known factors.
Strain in the early months
Lifting heavy things, a long spell of coughing, or straining on the toilet all push hard against a repair that is still knitting together. Hard constipation is easy to overlook and worth treating.
Your general health
Extra weight around the belly, diabetes that is not well controlled, smoking and long-term steroid tablets all slow the healing of muscle and skin.
Stopping smoking before and after surgery helps the wound, whatever else is going on.The type of operation
A long open cut across the side carries more risk than keyhole surgery. A repeat operation through the same scar also raises the risk. Your surgeon chooses the approach for reasons of safety first, so this is rarely a choice to make on hernia risk alone.
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When a hernia cannot wait
If the swelling at the scar suddenly becomes hard, very painful or tender, turns red or dark, and will not go back in when you lie down, go to an emergency department the same day. The same applies if it comes with vomiting, a swollen belly, or not passing wind or stools. These can mean the bowel is trapped and losing its blood supply. Do not wait for a clinic appointment, and do not try to push it back in by force.
At the clinic
How will the surgeon check whether it is a hernia?
Your story
When you first noticed the swelling, whether it gets bigger when you stand or cough, whether it aches by evening, and whether the wound had any trouble after the operation. Bring your discharge summary.
The examination
The surgeon looks at your side while you stand and lie down, and feels the scar as you cough or lift your head. A true hernia usually has an edge that can be felt, like the rim of a hole.
A scan, if needed
An ultrasound or a CT scan shows whether there is a real gap in the muscle, how wide it is and what is inside it. If you already have follow-up CT scans for the cancer, the hernia can often be seen on those.
A plan made with you
The surgeon explains whether it is a hernia or a slack muscle, and what the choices are. You do not have to decide on the same day unless there are warning signs.
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What can be done
Does a hernia after nephrectomy always need another operation?
No. Many small hernias that cause no pain are simply watched. Repair is usually offered when the hernia is growing, aching, getting in the way of daily life, or has a narrow neck that makes trapping more likely. Your team weighs these things against your fitness and your cancer follow-up plan.
Repairing it
Repair means closing the gap, usually with a sheet of surgical mesh that reinforces the weak area. It can be done through an open cut or by keyhole, depending on the size, the position near the ribs and hip bone, and any earlier surgery. Flank hernias sit close to bone and nerves, so they are among the harder hernias to repair, and they can come back.
Who repair may not suit
Surgery may be put off for someone still having cancer treatment, someone whose heart or lungs make another anaesthetic risky, or someone whose bulge is a slack muscle rather than a true gap. Mesh does not strengthen a muscle whose nerve supply has gone.
Ask your surgeon which kind of bulge you have before discussing repair. It changes every answer that follows.Commonly believed
What do families often get wrong about scar hernias?
"The swelling at the scar means the cancer has come back."
A soft bulge that grows when you stand and shrinks when you lie down is almost always a hernia or a slack muscle. It is a problem with the muscle wall, not a sign of cancer. If you are unsure, the surgeon can check both at the same visit.
"A tight belt will make the hernia go away."
A binder can make you more comfortable and hold the bulge in during the day. It does not close the gap in the muscle. Once a true hernia has formed, it does not heal on its own.
"After kidney surgery you should stay in bed to protect the wound."
Gentle walking from the first days helps healing and protects the lungs and legs. What strains the repair is heavy lifting and hard straining, not walking around the house.
Being straight with you
What can you do now, and what can this page not tell you?
This page cannot tell you whether your swelling is a hernia, whether it needs repair, or when. Those answers depend on an examination, sometimes a scan, and on where you are in your cancer treatment.
While the wound is still healing
Follow the lifting advice on your discharge sheet, even when you feel well. Hold a folded towel or pillow firmly against the scar when you cough, sneeze or laugh. Eat enough fibre and drink enough water to avoid straining. Keep blood sugar in check if you are diabetic.
If you have already noticed a bulge
Make a note of when it appeared and whether it changes size. Book a review with the team that did the operation, or with a surgeon who can see your operation notes. Bring the discharge summary and any recent scans. Watch for the warning signs above in the meantime.
Questions we are asked
Common questions about hernias after kidney surgery
How soon after nephrectomy can a hernia appear?
Most scar hernias show up in the first year or two, once you are back to normal activity and the muscle repair is under daily load. Some appear much later. A swelling that is present from the first days is more often fluid under the wound or bruising, which the team should also look at.
Is a hernia at the kidney scar dangerous?
Most are not dangerous day to day. The risk is that bowel gets trapped in the gap and loses its blood supply, which is an emergency. That is uncommon, but it is why sudden hard, painful swelling with vomiting needs same-day care rather than waiting for a routine appointment.
Can I lift my grandchild with a hernia?
Ask your surgeon, because it depends on the size and whether repair is planned. In general, avoid heavy lifting and bend your knees rather than your back. Holding a small child while seated is usually easier on the muscle wall than lifting them up from the floor again and again.
Will a hernia repair affect my remaining kidney?
A hernia repair works on the muscle wall, not on the kidney. Your team will still check your kidney blood tests before any anaesthetic and choose painkillers with a single kidney in mind. Tell the hernia surgeon clearly that you have had a kidney removed.
How do I know if it is a hernia or just a slack muscle?
You usually cannot tell at home. A true hernia often has an edge and may go back in with a gurgle when you lie down. A slack muscle bulges more evenly along the whole side. An examination while you cough, and sometimes a CT scan, settles the question.
Can a hernia come back after it is repaired?
Yes. Hernias at the side of the body are harder to repair than those at the front, because the gap sits close to the ribs and hip bone. Mesh lowers the chance of it returning but does not remove it. Ask your surgeon how they plan to anchor the repair and what signs to watch for.
Can the repair wait until my cancer treatment is over?
Often yes, if the hernia is not causing warning signs. Your cancer team and your surgeon decide together, because some treatments slow wound healing. Tell both teams about the hernia so that scans and appointments can be planned around it.
Is hernia repair covered by Aarogyasri or insurance?
Hernia repair is a common operation and is often covered by Aarogyasri, CGHS, ECHS, EHS and most cashless insurers, subject to each scheme's own rules and approval. Call the helpline with your card or policy details and we will help you check your cover before any appointment.
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Sources
- NHS — Hernia
- Cancer Research UK — Surgery for kidney cancer
- American Cancer Society — Surgery for Kidney Cancer
- Macmillan Cancer Support — Kidney cancer
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Numbness and Bulging at the Flank ScarWhen the bulge is a slack muscle rather than a herniaWound, Stitches and ScarsCaring for the wound so the muscle repair heals wellComplications and Red FlagsEvery sign after surgery that needs same-day careRecovery, Eating and Getting Back to LifeWhen lifting, work and travel can safely return
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Noticed a swelling at your kidney surgery scar?
Tell us what you have noticed and send your discharge summary. A surgical oncologist will help you work out what needs checking and how soon. One helpline serves every CION centre.