A hernia is usually not an emergency — most can be repaired electively at a time that suits you. But in a small number of cases, the bowel or fatty tissue protruding through the muscle defect becomes trapped (incarcerated) or has its blood supply cut off (strangulated). A strangulated hernia is a true surgical emergency: tissue can die within hours, leading to bowel perforation, sepsis and death if untreated. Recognising the warning signs early — and knowing exactly when to go to A&E rather than wait for an outpatient appointment — can be life-saving. Dr. Vanesha Varik, Specialist General Surgeon at Medcare Hospital Al Safa, Dubai, has compiled this clear, no-jargon guide to emergency hernia symptoms, what happens at the hospital, and the surgical options for incarcerated and strangulated hernias.
What is the difference between incarcerated and strangulated hernia?
An incarcerated hernia is a hernia that can no longer be pushed back (reduced) into the abdomen. The contents are stuck but the blood supply is still intact. This is painful but not immediately life-threatening — although it usually requires urgent surgery within 24 hours.
A strangulated hernia is an incarcerated hernia where the blood supply to the trapped tissue has been cut off. Without urgent surgery (within hours), the trapped bowel or fat dies, leading to perforation, peritonitis and sepsis. Strangulation is a true emergency.
Red-flag symptoms — go to A&E now
Attend the nearest emergency department immediately if your hernia develops any of the following:
- •Sudden severe pain at the hernia site that does not settle
- •A hernia lump that has become hard, tender and cannot be pushed back
- •Skin over the hernia turning red, dusky, purple or bluish
- •Nausea, vomiting or inability to keep fluids down
- •Bowel not opening or no passage of wind for more than 12 hours
- •Abdominal swelling, bloating or generalised abdominal pain
- •Fever, rapid heart rate or feeling unwell
- •Shock-like symptoms: cold sweats, dizziness, low blood pressure
Why time matters: the strangulation timeline
Once blood supply to bowel is cut off, ischaemia begins within 2 hours. Tissue death (necrosis) starts at around 4–6 hours. Perforation and faecal contamination of the abdomen can occur by 8–12 hours.
The longer the delay, the higher the risk that the surgeon will need to remove a segment of bowel — turning a 45-minute hernia repair into a major bowel resection with significantly higher mortality and longer recovery.
What happens when you arrive at A&E
Triage will fast-track suspected strangulated hernia. You can expect: rapid pain control with intravenous opioids, IV fluids, blood tests (full blood count, lactate, kidney function), abdominal X-ray or CT scan to assess for bowel obstruction, surgical review and consent for emergency theatre.
If strangulation is confirmed or strongly suspected, you will be taken to the operating theatre within 1–4 hours. Antibiotics will be given before incision.
Emergency hernia surgery — what's involved
The surgeon's priorities are: relieve the strangulation, assess the trapped tissue, remove any dead bowel if present, and repair the hernia defect.
If the bowel is viable (alive) once released, a standard mesh repair can usually be performed. If a segment of bowel has died and required resection, the surgeon may avoid mesh in the contaminated field and use a tissue (sutured) repair, with planned mesh repair at a later date.
Emergency surgery may be open or laparoscopic depending on stability and surgeon experience. Recovery is typically longer than elective surgery — 3–7 days in hospital is common.
Why elective repair is always safer than emergency
Mortality from elective hernia repair is well under 1%. Mortality from emergency strangulated hernia repair with bowel resection can be 5–15%, particularly in elderly patients. The single best way to avoid this risk is to have symptomatic hernias repaired electively, before they strangulate.
If you have a hernia that is enlarging, becoming more painful, or starting to be difficult to push back, do not wait. Book a surgical consultation now.
Hernias most likely to strangulate
Strangulation risk is higher for: femoral hernias (highest risk per year — always repair when diagnosed), small umbilical hernias with a tight neck, paraumbilical hernias, and any hernia where the contents have recently become harder to reduce.
Larger inguinal hernias paradoxically have a lower per-year strangulation risk because the neck is wider — but they still cause symptoms and should be repaired.