By Dr. Inam Khan | Pediatric & General Surgeon

An inguinal hernia is one of the most common surgical conditions seen in infants and children. Many parents notice a swelling in the groin or scrotum that becomes more obvious when the child cries, coughs, strains, or stands. Although it may disappear when the child relaxes, an inguinal hernia should never be ignored, because it can become trapped and cause serious complications.

In this blog, I will explain what an inguinal hernia is, why it occurs, which children are at higher risk, how it is diagnosed, when surgery is needed, and what parents should expect after the operation.

What Is an Inguinal Hernia?

An inguinal hernia occurs when a part of the intestine or other abdominal content passes through a weakness or opening in the groin region, called the inguinal canal.

In children, this is usually not caused by muscle weakness from heavy lifting as it often is in adults. Instead, it is usually a congenital (present since birth) condition related to the way the baby develops before birth.

How Does It Develop?

During pregnancy, the testicles develop inside the abdomen and later descend into the scrotum through a small passage called the processus vaginalis.

Normally, this passage closes before or shortly after birth. If it fails to close, a connection remains between the abdomen and the groin. Through this opening, intestine or fluid can pass, resulting in an inguinal hernia or a hydrocele.

In girls

Girls also have a small pouch called the canal of Nuck. If it remains open, an inguinal hernia can develop, and sometimes the ovary may enter the hernia sac.

How Common Is It?

Occurs in 1–5% of all children

Much more common in boys

Seen more frequently in premature babies

About 60% occur on the right side

10–15% occur on both sides

Premature infants have a particularly high risk because the processus vaginalis may not have had enough time to close before birth.

Risk Factors

Certain factors increase the likelihood of an inguinal hernia:

Risk factor

Risk level

Prematurity

High

Male gender

High

Family history

Medium

Undescended testis

High

Connective tissue disorders

Medium

Increased abdominal pressure

Low

Conditions such as Ehlers-Danlos syndrome, Marfan syndrome, and some abdominal wall disorders may also be associated with hernias.

Symptoms of Inguinal Hernia in Children

The most common symptom is a painless swelling in the groin.

Parents may notice:

A bulge in the groin

Swelling extending into the scrotum

The swelling becomes larger when the child cries or coughs

It may disappear during sleep

The child is usually otherwise active and feeding normally

In infants

The swelling may appear only intermittently, so parents often report:

It comes and goes.

This is very typical of a reducible inguinal hernia.

What Is a Reducible Hernia?

A reducible hernia is one in which the intestine can move back into the abdomen either spontaneously or with gentle pressure by a doctor.

Features

Soft swelling

Appears during crying or straining

Disappears when relaxed

Usually painless

Even though it is reducible, surgery is still recommended, because the hernia can become trapped at any time.

What Is an Incarcerated Hernia?

An incarcerated hernia occurs when the intestine becomes trapped and cannot return to the abdomen.

Warning signs

Swelling becomes hard and painful

Child cries excessively

Vomiting

Abdominal distension

Redness over the swelling

Swelling does not disappear

This is a surgical emergency.

Why is it dangerous?

The trapped intestine may lose its blood supply, leading to strangulation, bowel damage, and even life-threatening infection.

Inguinal Hernia in Girls

In girls, the hernia may contain:

Intestine

Ovary

Fallopian tube

An ovary trapped in a hernia can lose its blood supply, so early surgical treatment is especially important in female infants.

How Is It Diagnosed?

Medical history

Your doctor will ask:

When the swelling was first noticed

Whether it appears during crying or straining

Whether it disappears on its own

Any episodes of pain or vomiting

Birth history, especially prematurity

Physical examination

The diagnosis is usually made by examination alone.

The doctor will examine the child while:

Crying

Coughing (older children)

Standing (if age appropriate)

A typical hernia feels like a soft bulge in the groin.

Is Ultrasound Necessary?

In most children, ultrasound is not required. It may be helpful when:

The swelling is not present during examination

The diagnosis is uncertain

A hydrocele needs to be distinguished from a hernia

The ovary is suspected within the hernia sac in girls

Difference Between Hernia and Hydrocele

Many parents confuse these two conditions.

Feature

Inguinal hernia Hydrocele

Contents Intestine/tissue Fluid

Size changes Yes Sometimes

Can be pushed back Usually yes No

Risk of incarceration Yes No

Treatment Surgery Often observation(surgery may be required)

A hydrocele is generally less urgent, while a hernia requires surgical repair.

Why Is Surgery Needed?

Pediatric inguinal hernias do not close on their own.

The definitive treatment is surgery.

The goals are to:

Prevent incarceration

Prevent strangulation

Relieve symptoms

Allow normal growth and activity

When should surgery be done?

Soon after diagnosis in most children

Within days to weeks for infants

Urgently if the hernia has been incarcerated

Premature infants are often repaired before discharge from the neonatal unit or shortly afterward.

What Happens Before Surgery?
Preoperative assessment

The child will be evaluated for:

General health

Respiratory infection

Fever

Feeding status

Any associated congenital conditions

Fasting

Parents will receive instructions about when to stop:

Milk feeds

Formula

Solid foods

Clear liquids

Following these instructions is very important for safe anesthesia.

How Is the Surgery Performed?

The operation is called herniotomy.

Anesthesia

The child is given general anesthesia, so they are completely asleep and feel no pain.

Surgical steps

A small incision is made in the groin.

The hernia sac is identified.

The sac is separated from the spermatic cord structures.

The sac is tied off high at the internal ring (high ligation).

The incision is closed with absorbable stitches.

In children, the abdominal wall muscles are usually normal, so mesh is not routinely required.

Laparoscopic Hernia Repair

Some centers perform laparoscopic surgery.

Advantages

Smaller scars

Less postoperative pain

Ability to inspect the opposite side

Faster recovery in some patients

Disadvantages

Requires specialized equipment

Slightly longer operating time in some cases

Both open and laparoscopic repairs have excellent success rates.

What About the Opposite Side?

A child with a hernia on one side may have a patent processus vaginalis on the other side.

More common in infants

More common in premature babies

Laparoscopy allows direct inspection

Whether to explore the opposite side routinely is a matter of surgical judgment and institutional practice.

Recovery After Surgery

Most children go home the same day.

Immediately after surgery

The child may have:

Mild groin pain

Sleepiness from anesthesia

Temporary nausea

Slight swelling around the incision

Pain control

Usually managed with:

Paracetamol (acetaminophen)

Ibuprofen (if appropriate for age)

Severe pain is uncommon.

Feeding

Infants can usually resume feeding within a few hours.

Older children can start with clear liquids and then return to a normal diet.

Wound Care
Parents should:

Keep the area clean and dry

Avoid soaking the wound for a few days

Allow adhesive strips to fall off naturally

Watch for signs of infection

Contact your surgeon if you notice:

Fever

Increasing redness

Pus discharge

Severe swelling

Persistent vomiting

Activity After Surgery

Children usually recover very quickly.

Infants generally return to their usual activity within 24–48 hours.

Possible Complications

Herniotomy is a very safe operation, but no surgery is completely without risk.

Early complications

Bleeding

Wound infection

Scrotal swelling

Bruising

Specific complications in boys

Rarely, the structures supplying the testis can be affected:

Injury to the vas deferens

Reduced blood supply to the testis

Testicular atrophy (very rare)

Recurrence

The hernia can come back, but this is uncommon.

Risk of recurrence

Less than 1% in most healthy children

Higher in:

Premature infants

Children with connective tissue disorders

Patients with increased abdominal pressure

What Is the Prognosis?

The outlook is excellent.

Surgery is highly successful.

Children grow and develop normally.

Long-term restrictions are not needed.

Fertility is not affected in the vast majority of patients.

Parents are often surprised by how quickly their child returns to normal activities.

Can an Inguinal Hernia Be Prevented?

Because it is usually congenital, it cannot be prevented.

However, early recognition can prevent complications.

Seek medical attention if you notice:

Any groin or scrotal swelling

Swelling that appears during crying

A swelling that suddenly becomes painful

Vomiting associated with groin swelling

About the Author

Dr. Inam Khan is a Consultant Pediatric and General Surgeon with experience in the diagnosis and surgical management of common childhood conditions, including inguinal hernia, hydrocele, undescended testes, and other neonatal and pediatric surgical disorders. Through this blog, he aims to provide accurate, easy-to-understand health information for parents and the general public.