Hernia warning signs are the symptoms that show a hernia may have become trapped or lost its blood supply: sudden severe pain, a bulge that turns hard and will not go back, vomiting, and being unable to pass wind or open your bowels. Most hernias are not emergencies, but these signs are. This article is part of our guide to laparoscopic surgery, and it explains the six symptoms that need urgent care and how they differ from an ordinary hernia.
A hernia happens when tissue, often fat or a loop of bowel, pushes through a weak spot in the muscle wall of the abdomen. The commonest types are inguinal hernias in the groin, femoral hernias at the top of the thigh, umbilical and paraumbilical hernias around the navel, and incisional hernias through an old scar.
What a routine hernia usually feels like
Most hernias begin as a soft bulge that you notice when standing, coughing or straining, and which shrinks or disappears when you lie down. This is called a reducible hernia.
A routine hernia may cause an ache, a dragging feeling or heaviness in the groin, especially at the end of the day or after lifting. Some cause no pain at all. These symptoms are a reason to see a surgeon and plan treatment, but not to rush to an emergency department.
Why some hernias become dangerous
The risk comes when the tissue that has pushed through becomes squeezed at the neck of the hernia and cannot slip back. This is an incarcerated or trapped hernia.
If the squeeze tightens enough to cut off the blood supply, the hernia becomes strangulated. Strangulated tissue can start to die within hours, which is why it is treated as a surgical emergency.
6 hernia warning signs that need urgent care
If you notice any of the signs below, seek emergency medical help the same day. Do not wait for a planned appointment, and do not try to push a painful hernia back with force.
1. Sudden, severe or rapidly worsening pain
A hernia that suddenly becomes very painful, or pain that keeps building over minutes to hours, is the most important warning sign. Severe pain at the hernia site is different from the mild ache many people live with.
2. A bulge that becomes firm, tender and will not go back
If a hernia that used to slip back in stays out and feels hard or tender to touch, it may be trapped. This is especially worrying if it was previously soft.
3. Red, purple or dark skin over the bulge
A change in the colour of the skin over the hernia can mean the tissue underneath is losing its blood supply. This needs immediate attention.
4. Nausea and vomiting
Feeling sick or vomiting together with hernia pain can mean a loop of bowel is trapped and blocked. Vomiting that keeps coming back is a strong reason to go to hospital.
5. Unable to pass wind or open your bowels
Not being able to pass gas or stool, often with a swollen tummy, suggests bowel obstruction. Together with a painful hernia, this is an emergency.
6. Fever or feeling generally very unwell
A high temperature, a racing heart or feeling faint alongside hernia pain can be signs that strangulation is affecting the whole body. Do not wait to see whether it settles.
Routine hernia vs warning signs at a glance
The table below sums up the difference. It is a guide, not a diagnosis, so if you are unsure, get medical advice promptly.
| Feature | Routine hernia | Warning sign |
|---|---|---|
| Bulge | Soft, goes back when lying down | Firm, tender, stays out |
| Pain | Mild ache or heaviness | Sudden, severe or worsening |
| Skin | Normal colour | Red, purple or dark |
| Bowels | Normal | No wind or stool, swollen tummy |
| Stomach | No nausea | Nausea or repeated vomiting |
| What to do | Book a surgical review | Go to emergency care now |
Which hernias carry a higher risk?
Femoral hernias are more likely to become trapped than inguinal hernias because they pass through a narrow, tight channel. They are more common in women and are usually repaired soon after diagnosis rather than watched.
Hernias with a narrow neck, those that have recently become harder to push back, and hernias that have caused painful episodes before also deserve earlier repair. Your surgeon will look at the type and size of the hernia when advising on timing.
What to do on the way to hospital
If you think your hernia is trapped, a few simple steps help. Avoid eating or drinking until a doctor has seen you, because you may need an anaesthetic soon.
Note when the pain started and whether you have vomited, and bring a list of your regular medicines. Lie down if that eases the pain, but do not press hard on the bulge or try to manage the pain at home for hours. These signs apply to every type of hernia, including umbilical hernias and hernias in old scars, not only groin hernias.
What happens in an emergency
In hospital, a doctor will examine the hernia and may arrange blood tests and a scan. If the hernia is strangulated or the bowel is blocked, emergency surgery is needed to release the trapped tissue and repair the weakness.
If part of the bowel has been damaged, that section may need to be removed. This is one reason why acting early matters: the sooner a trapped hernia is treated, the more likely the repair stays straightforward.
Planned repair: the safer route
For most people, the best way to avoid an emergency is to have a hernia assessed and, where advised, repaired as a planned operation. Planned repair is generally simpler and recovery is quicker than surgery done in an emergency.
Inguinal hernias are commonly repaired by keyhole surgery with a mesh that reinforces the weak area. You can read how the operation works and what recovery involves on our laparoscopic inguinal hernia repair page.
When waiting is reasonable
Not every hernia needs surgery straight away. For some men with a small inguinal hernia and few symptoms, watchful waiting is a recognised option, provided they know the warning signs above.
Dr. Elbasatiny assesses the type of hernia, your symptoms, your general health and the demands of your work before advising on timing. Whatever the plan, keep this list of warning signs somewhere you can find it.