A hernia is a sac formed by the lining of the abdominal cavity (peritoneum). The sac comes through a hole or weak area in the strong layer of the belly wall that surrounds the muscle. This layer is called the fascia.
Which type of hernia you have depends on where it is:
- Femoral hernia is a bulge in the upper thigh, just below the groin. This type is more common in women than men.
- Hiatal hernia occurs in the diaphragm muscle that separates the chest and abdomen. Part of the upper stomach pushes into the chest.
- Incisional hernia can occur through a scar if you have had abdominal surgery in the past.
- Umbilical hernia is a bulge around the belly button. It occurs when the muscle around the belly button does not close completely after birth.
- Inguinal hernia is a bulge in the groin. It is more common in men. It may go all the way down into the scrotum.
Inguinal hernia is the result of an organ, usually bowel, protruding through a weak point or tear in the thin muscular abdominal wall. Inguinal hernias can restrict blood supply to the bowel herniated through the defect, creating a medical emergency.
Hernia - Animation
You're lifting a heavy box, when suddenly, you feel a strain in your stomach or groin. If you also feel a bulge there, you might have a hernia. The bump that you feel is a part of what's in your abdomen bulging out through a weak spot in the muscle or tissue that surrounds it. A hernia is kind of like pushing your finger against the side of a balloon. What type of hernia you have depends on where the bulge is located. A femoral hernia is a bulge in the upper part of your thigh. A hiatal hernia is located in the top part of your stomach. An umbilical hernia bulges around your belly button. Inguinal hernias are in the groin area. And incisional hernias usually form around a scar from a past surgery in your abdomen. You can get a hernia if you lift something that's too heavy, or strain too hard while coughing, urinating, or having a bowel movement. Sometimes babies are born with a hernia. That happens when the lining that is supposed to hold the abdominal organs doesn't totally close before birth. Some hernias don't cause any symptoms. You might live with a hernia for a while without even noticing that you have it. Or, you may see an actual bulge in your leg, stomach, or groin. Hernias can sometimes be painful, especially when you strain or lift something heavy. Your doctor should be able to locate the hernia during an exam. If your hernia is small and doesn't bother you, you may not need to do anything but keep in touch with your doctor to make sure it isn't growing. If the hernia is big or painful, your doctor may recommend surgery to plug the opening. The one big risk to having a hernia is that with some types the tissue can get caught inside the hole. This is called strangulation. It can be very dangerous, because blood is cut off to the part of the organ that's trapped. Eventually that tissue will die. If you have a strangulated hernia, you'll need to have emergency surgery. Surgery is the only way to reverse a hernia, although in young children umbilical hernias will often go away on their own. If you have a small hernia and decide not to have surgery, be on the lookout for any changes. Call the doctor right away if you have pain, nausea, vomiting, or a fever, or if your hernia turns red, purple, or another color. These could be signs of strangulation. To avoid a hernia in the first place, be careful when lifting heavy objects. Drink plenty of fluids and add fiber to your diet so you won't have to push too hard on the toilet. And see a urologist if you're straining while urinating.
Usually, there is no clear cause of a hernia. Sometimes, hernias can occur due to:
- Heavy lifting
- Straining while using the toilet
- Any activity that raises the pressure inside the belly
Hernias may be present at birth, but the bulge may not be evident until later in life. Some people have a family history of hernias.
Babies and children can get hernias. It happens when there is weakness in the belly wall. Inguinal hernias are common in boys. Some children do not have symptoms until they are adults.
Any activity or medical problem that increases pressure on the tissue in the belly wall and muscles may lead to a hernia, including:
There are usually no symptoms other than a visible bulge. Some people have discomfort or pain. The discomfort may be worse when standing, straining, or lifting heavy objects. In time, the most common complaint is a bump that is sore and growing.
When a hernia gets bigger, it may get stuck inside the hole and lose its blood supply. This is called strangulation. This causes pain and swelling at the site of strangulation. Symptoms may include:
- Nausea and vomiting
- Not being able to pass gas or have bowel movements
When this occurs, surgery is needed right away.
Exams and Tests
The health care provider can usually see or feel a hernia when you are examined. You may be asked to cough, bend, push, or lift. The hernia may get bigger when you do this.
The hernia (bulge) may not be easily seen in infants and children, except when the child is crying or coughing.
Ultrasound uses high-frequency sound waves to make images of organs and structures inside the body.Read Article Now Book Mark Article
An abdominal CT scan is an imaging method. This test uses x-rays to create cross-sectional pictures of the belly area. CT stands for computed tomog...Read Article Now Book Mark Article
If there is a blockage in the bowel, an x-ray of the abdomen will likely be done.
Surgery is the only treatment that can permanently fix a hernia. Surgery may be more risky for people with serious medical problems.
Surgery repairs the weakened abdominal wall tissue (fascia) and closes any holes. Most hernias are closed with stitches and sometimes with mesh patches to plug the hole.
An umbilical hernia that does not heal on its own by the time a child is 5 years old will likely be repaired.
The outcome for most hernias is usually good with treatment. It is rare for a hernia to come back. Incisional hernias are more likely to return.
In rare cases, inguinal hernia repair can damage structures involved in the function of a man's testicles.
Another risk of hernia surgery is nerve damage, which can lead to numbness in the groin area.
If a part of the bowel was trapped or strangulated before surgery, bowel perforation or dead bowel may result.
When to Contact a Medical Professional
Contact your provider right away if you have:
- A painful hernia and the contents cannot be pushed back into the abdomen by lying down and using gentle pressure
- Nausea, vomiting, or a fever along with a painful hernia
- A hernia that becomes red, purple, dark, or discolored
Contact your provider if you have:
- Groin pain, swelling, or a bulge.
- A bulge or swelling in the groin or belly button, or that is associated with a previous surgical cut.
To prevent a hernia:
- Use proper lifting techniques.
- Lose weight if you are overweight.
- Relieve or avoid constipation by eating plenty of fiber, drinking lots of fluid, going to the bathroom as soon as you have the urge, and exercising regularly.
- Men should see their provider if they strain with urination. This may be a symptom of an enlarged prostate.
Debra G. Wechter, MD, FACS, General Surgery Practice Specializing in Breast Cancer, Virginia Mason Medical Center, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
Aiken JJ. Inguinal hernias. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 373.
Poulose BK, Carbonell AM, Rosen MJ. Hernias. In: Townsend CM Jr, Beauchamp RD, Evers BM, Mattox KL, eds. Sabiston Textbook of Surgery. 21st ed. St Louis, MO: Elsevier; 2022:chap 45.