In short
A hernia is tissue pushing through a weak spot in the muscle wall. Most are not urgent, but a hernia that turns painful and stops reducing is an emergency with a short window.
Emergency if: A hernia that is suddenly painful, firm and cannot be pushed back, especially with vomiting, fever or discoloured skin — go to an emergency department now.
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On this page
01
What a hernia is
A hernia happens when an internal part of the body — usually fat or a loop of bowel — pushes through a weakness in the surrounding muscle or tissue wall. The result is a lump that classically appears on standing, coughing or straining and disappears on lying down, because gravity and pressure push the contents out and rest lets them slide back.
That reducibility is the reassuring feature. A hernia that can be gently pushed back, or that flattens when you lie down, has contents with a free blood supply. A hernia that has become firm, tender and will not go back is the one that needs urgent attention.
02
The common types
Inguinal hernias occur in the groin and are by far the most common, particularly in men. Femoral hernias appear slightly lower in the upper thigh, are much less common, occur more often in women, and carry a higher risk of complications — which is why they are usually repaired rather than watched. Umbilical hernias sit at the navel and are common in infants, where most close on their own.
Incisional hernias develop through the scar of a previous abdominal operation, and hernias can also occur around a stoma or in the lower back. A hiatus hernia is a different animal: part of the stomach slides up through the diaphragm into the chest, producing reflux symptoms rather than a visible lump, and it is managed with reflux treatment rather than routine surgery.
03
Why they form
Hernias need a weak point and a force pushing against it. The weak point may be a natural gap that never closed fully, a surgical scar, or muscle that has thinned with age. Some people are more prone because of the connective tissue they inherited, which is why hernias sometimes run in families.
The pushing force is anything that repeatedly raises pressure inside the abdomen: chronic cough, long-standing constipation and straining, difficulty passing urine from an enlarged prostate, heavy lifting with poor technique, pregnancy, and carrying excess weight. Treating the cough or the constipation matters — repairing a hernia while the straining continues invites a recurrence.
04
Repair, or watch and wait
Some hernias improve on their own, while others need surgery, and the decision depends on the type, what caused it, and whether it is new or has come back after previous treatment. For a small, painless, easily reducible inguinal hernia in an adult, watchful waiting is a reasonable option, since many stay stable for years. Most umbilical hernias in babies close without any operation.
Repair is generally advised when the hernia is painful, enlarging, interfering with daily life, or of a type with a higher complication risk such as a femoral hernia. Surgery may be open or keyhole, usually reinforcing the wall with a mesh, and is often a day procedure. A truss or support belt does not fix anything and can mask a hernia that is getting worse.
05
Strangulation: the emergency
Two serious complications can occur. Obstruction means a loop of bowel is trapped and its contents cannot pass, producing colicky pain, vomiting, bloating and constipation. Strangulation means the blood supply to the trapped tissue is cut off, which causes tissue to die within hours and requires emergency surgery.
The warning sign is pain in or around the hernia, especially with smaller hernias, which is a sign of strangulation as the muscle tightens around the trapped tissue. Take it seriously if a previously soft, painless lump becomes hard, tender and impossible to push back, particularly with vomiting, fever, or skin over it turning red or dusky. Do not keep trying to force it back — get emergency help.
06
Living with one, and after repair
While waiting for repair, reduce the forces that worsen it: treat constipation and cough, lift with your legs and avoid straining, and maintain a healthy weight. Know the emergency signs, and make sure anyone at home knows them too, because the window for strangulation is measured in hours.
After repair, most people return to light activity within days and to normal activity over a few weeks, on advice specific to the operation. Some discomfort and bruising is expected. Contact the surgical team for increasing pain, fever, redness or discharge from the wound, and for any recurrence of a lump at the site.
When to act
Routine — see a doctor
A soft, painless lump that flattens on lying down: arrange a non-urgent appointment to confirm the type and discuss whether repair is worthwhile.
Same-day — call promptly
A hernia that has become persistently uncomfortable, is enlarging, or is becoming harder to push back than before.
Emergency — act now
A hernia that is suddenly painful, firm and cannot be pushed back, especially with vomiting, fever or discoloured skin — go to an emergency department now.
Values mentioned in this story
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Sources
- Hernia — NHSnhs.uk
- Inguinal Hernia Repair — NHSnhs.uk
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