What is an inguinal hernia?

An inguinal hernia in children is fundamentally different from the adult version. In children, it forms because of a small connection between the abdominal cavity and the inguinal canal that should have closed before birth but did not. Through this opening, abdominal contents — usually a loop of intestine, fat, or in girls an ovary — can push down into the groin, creating a visible bulge.

This is called an indirect inguinal hernia. The "direct" type that adults sometimes develop from weakened abdominal muscles is extremely rare in children.

How common is it, and who gets it?

  • Frequency: A few percent of all children develop an inguinal hernia.
  • Boys vs. girls: Boys are roughly six times more likely to be affected than girls.
  • Side: The hernia appears most often on the right side, but in about 10 percent of children both sides are affected.
  • Premature infants: Babies born prematurely have a significantly higher risk.

Recognizing the signs

An inguinal hernia typically appears as a painless bulge or lump in the groin crease. Parents often notice it most clearly when the child cries, strains, coughs, or stands up — situations where pressure inside the abdomen increases.

The bulge usually disappears or can be gently pushed back when the child relaxes or lies down. It is rarely red, and rarely tender to touch. Many parents are reassured to learn that even when the bulge is not visible at the doctor's appointment, a clear history described by the parents is usually enough to make the diagnosis.

When to seek emergency care: If the bulge becomes hard, painful, red, or cannot be pushed back, this may indicate an incarcerated hernia — meaning the trapped tissue has lost its blood supply. This is a surgical emergency. Go to the nearest emergency department immediately.

The risk of incarceration

The reason inguinal hernias are always operated on — rather than watched — is the risk of incarceration, where part of the bowel becomes trapped and loses circulation.

  • Infants under one year: The risk is highest, up to about 25 percent without treatment.
  • Children over one year: Risk drops considerably, to under 10 percent, but does not disappear.

The surgery: what happens and why it works

Pediatric inguinal hernia repair is one of the most commonly performed operations in children, and it is technically straightforward in experienced hands.

The surgeon makes a small incision in the groin crease (a "skin line" that hides the resulting scar very well). The open passage between the abdominal cavity and the inguinal canal — called the processus vaginalis — is identified and tied off with a dissolvable suture. The opening is closed; the abdominal wall itself in children is healthy and does not need the synthetic mesh adults often require.

Recovery is typically rapid. Most children go home the same day, return to normal play within a few days, and have minimal restrictions after a week or two.

Common questions parents ask

Can a hernia close on its own?

No. Unlike umbilical hernias, inguinal hernias do not heal spontaneously. Surgery is the only treatment.

Should both sides be checked even if only one is bulging?

This is a long-running debate among pediatric surgeons. Some surgeons routinely explore both sides, especially in young infants. Others rely on examination and ultrasound, operating on one side and watching the other. Discuss the approach with your surgeon.

Is general anesthesia safe for a young child?

Modern pediatric anesthesia is very safe in healthy children. The benefits of fixing the hernia far outweigh the small risks of anesthesia, especially given the risk of incarceration if surgery is delayed.