A hernia is a bulge that forms when an organ or fatty tissue pushes through a weak spot in the muscle wall. The main types are named by location: inguinal (groin), umbilical (navel), incisional (old surgical scar) and hiatal (upper stomach). Each behaves differently and needs the right treatment.
A hernia happens when an internal part of the body — most often a loop of intestine or a pad of fatty tissue — pushes through a weakness or tear in the muscle or connective tissue wall that is meant to hold it in place. The result is usually a visible bulge, sometimes with aching, heaviness or discomfort that becomes worse when you cough, lift, strain or stand for a long time, and eases when you lie down. Hernias are extremely common, they do not heal on their own, and they tend to grow slowly over months or years rather than getting better. Because the right treatment depends on exactly which kind you have, understanding the different types is genuinely useful, and knowing the basics also makes any conversation with your surgeon far more productive. Hernias are named mainly according to where they appear on the body, and each type behaves a little differently. This guide explains the four most commonly discussed kinds — inguinal, umbilical, incisional and hiatal — together with several less common varieties, so you know what to look for, why hernias form in the first place, how they are diagnosed, and when it is time to see a surgeon rather than wait and hope it settles on its own.
What exactly is a hernia, and why does it happen?
A hernia is a bulge that forms when an organ or fatty tissue squeezes through a weak point or tear in the muscle or connective tissue meant to contain it. Most hernias appear on the abdominal wall or in the groin. They usually enlarge slowly over time and will not close or repair themselves without treatment.
- A natural weak spot present from birth — some people are simply born with a thinner area or a small opening in the abdominal wall that can quietly give way years later, which is partly why hernias sometimes seem to run in families.
- Ageing — muscle and connective tissue gradually lose their strength and elasticity over the years, so the wall becomes more likely to weaken and allow a bulge to push through as we grow older.
- Previous surgery or injury — an operation or a significant wound can leave a permanently weaker patch in the abdominal wall, particularly along a healed surgical scar where the layers were cut and repaired.
- Heavy or repetitive lifting — straining the abdomen during manual work, weightlifting or repeatedly lifting children raises the pressure inside the abdomen and forces it against any weak points in the wall.
- Chronic coughing or sneezing — a long-standing cough from smoking, asthma or another lung condition repeatedly drives pressure against the wall and can, over time, help a hernia to form.
- Straining on the toilet — long-standing constipation, and the regular hard straining that goes with it, is a common and often overlooked everyday contributor to hernias of the abdominal wall.
- Pregnancy and obesity — the extra load of a growing baby or of carrying excess weight steadily raises the pressure inside the abdomen over a prolonged period, stretching and weakening the wall.
- A build-up of fluid in the abdomen — some medical conditions cause fluid to collect inside the abdomen, which raises the internal pressure and can contribute to a hernia forming or enlarging over time.
What is an inguinal hernia?
An inguinal hernia occurs in the groin, where tissue pushes through a weak area of the lower abdominal wall near the inguinal canal. It is by far the most common type and is much more frequent in men. The usual sign is a groin or scrotal bulge that appears on standing or straining and eases when you lie down.
Many inguinal hernias cause a dull dragging or aching sensation in the groin rather than sharp pain, and in the early stages some cause no symptoms at all beyond an intermittent bulge that comes and goes. The discomfort often builds through the day, especially after standing, walking or heavy activity, and settles again with rest or when you lie down. Left alone, an inguinal hernia rarely gets smaller and tends to enlarge slowly over time, which can make a later repair a little more involved. Although far more common in men, inguinal hernias do occur in women, where they can be smaller and harder to feel, so any persistent groin lump or ache in either sex is worth having examined rather than ignored. Because the groin carries important blood vessels and, in men, the spermatic cord, repairs here are carried out carefully to protect these structures. Surgeons describe two subtypes — indirect hernias, which follow the natural canal and are more common in younger people, and direct hernias, which push straight through a weakened part of the wall and are seen more often with age. You can learn much more in our detailed guide to inguinal hernia, which covers the symptoms, how the diagnosis is confirmed and the repair options available for this very common problem.
What are umbilical and incisional hernias?
An umbilical hernia appears at or near the navel, where the abdominal wall is naturally a little weaker, while an incisional hernia develops through the scar of a previous abdominal operation. Both show as a soft bulge that becomes clearer when you cough, laugh or sit up, and both are types of ventral hernia of the front abdominal wall.
Umbilical hernias are very common in babies, and in infants they often close on their own as the abdominal muscles strengthen during the first few years of life, so surgery is frequently not needed. In adults, however, an umbilical hernia usually does not resolve by itself and is often linked to raised abdominal pressure from pregnancy, weight gain or a build-up of fluid. Our page on umbilical hernia explains when simple monitoring is reasonable and when repair is advised. An incisional hernia, by contrast, arises in tissue that has already been operated on, where the healed muscle wall is weaker than the surrounding area. It can appear months or even years after surgery and is more likely after a wound infection, in people who are overweight, or when the wound was under strain while it healed. Keeping to a healthy weight and avoiding heavy lifting while a surgical wound heals can reduce the chance of one forming. Because these hernias vary greatly in size and may enlarge over time, repair usually reinforces the area with a mesh, as explained on our incisional hernia page. In both cases, the earlier a hernia is assessed, the more straightforward the discussion about whether and when to repair it tends to be.
What is a hiatal hernia?
A hiatal hernia is different because it happens inside the body rather than under the skin. Part of the stomach pushes upward through the diaphragm — the muscle separating the chest from the abdomen — through an opening called the hiatus. There is no visible bulge; instead the symptoms are acid reflux, heartburn and, in larger cases, difficulty swallowing.
Are there other, less common types of hernia?
Yes. Beyond the four main groups, surgeons recognise several less common hernias, again named largely by location. They share the same basic mechanism — tissue pushing through a weak point — but occur in different parts of the abdominal wall and can be harder to detect because the bulge may be small, deep or easy to miss on examination.
- Femoral hernia — appears in the upper thigh just below the groin crease and is more common in women than in men; it matters because its narrow opening means it carries a higher risk of becoming trapped and needing urgent surgery.
- Epigastric hernia — forms in the midline of the upper abdomen, between the navel and the breastbone, often as a small and sometimes tender bulge of fatty tissue that may only be noticed by chance.
- Spigelian hernia — a rarer hernia that pushes through the side of the abdominal wall; because it can sit beneath the intact surface muscle, it is sometimes difficult to feel and may need an ultrasound or CT scan to confirm.
- Ventral hernia — a general umbrella term for any hernia through the front of the abdominal wall, which includes umbilical and incisional hernias as well as some that appear elsewhere along the midline.
- Recurrent hernia — a hernia that returns at the site of an earlier repair; because the tissue there has already been operated on, it may call for a different surgical approach and is assessed carefully.
- Obturator hernia — a very rare hernia deep in the pelvis, seen mainly in older, thinner women, which often causes pain rather than a visible lump and usually needs a scan to diagnose.
- Sports hernia — strictly a groin strain rather than a true hernia, this causes chronic groin pain in active people without an obvious bulge and is managed differently, though it is often mentioned alongside true hernias.
How are the different types of hernia diagnosed and treated?
Most hernias are diagnosed when a doctor examines the bulge and asks you to cough or strain so it can be felt clearly. Sometimes an ultrasound, CT or other scan is used when the diagnosis is uncertain or the hernia is deep. Treatment depends on the type, size, symptoms and your general health.
Surgical repair either stitches the weakened area closed or, far more commonly, reinforces it with a soft mesh that supports the wall while your own tissue heals strongly around it — an approach that greatly reduces the chance of the hernia returning. Many abdominal and groin hernias can now be repaired using keyhole (laparoscopic) techniques, which involve a few small cuts rather than one large incision and typically mean less discomfort and a quicker return to normal activity for suitable patients; you can read about this on our laparoscopic hernia repair page. Open repair, through a single larger incision, remains an excellent and well-proven option and is sometimes the more appropriate choice depending on the hernia. Not every hernia needs immediate surgery — small, painless ones may simply be watched — but surgery is the only way to actually cure a hernia, and repair is often advised when a hernia causes symptoms, is enlarging, or could become trapped. Your surgeon will also take into account your age, occupation and any other health conditions when recommending whether and how to proceed. Because the best plan differs for every person, the sensible step if you have noticed a bulge or persistent discomfort is to have it assessed properly, so if you would like an expert opinion you can book a consultation for a full evaluation.
This article provides general educational information only and is not a substitute for a professional medical consultation, diagnosis or treatment. Every hernia is different, and the right approach depends on your individual situation, which can only be assessed in person by a qualified doctor. If you have a bulge, groin discomfort or reflux symptoms, please book an appointment with Dr. Sujan Shrestha for careful, personalised and expert advice.