Why do pediatric hernias occur?
Before birth, a boy's testes descend from above the abdominal wall through the inguinal canal into the scrotum. The passageway for this descent is called the processus vaginalis. If it does not close completely, or does not close tightly enough, tissue inside the abdomen, such as bowel or omentum, may protrude through the opening at some point and form a pediatric hernia. The great majority are indirect inguinal hernias. In girls, the round ligament of the uterus extends along a similar path, and the mechanism is similar.
This is caused by a congenital structural factor; it does not have a direct cause-and-effect relationship with later habits such as crying or straining. Crying, coughing, or straining during bowel movements only makes an existing bulge more noticeable; they do not cause the hernia.
How can parents observe it at home?
The bulge is usually more noticeable at these times:
- When a baby cries, strains during a bowel movement, or coughs
- After standing or being especially active
- When changing diapers or bathing, when you can look for unusual bulging in the groin or scrotum
When a child is lying down, resting, and relaxed, the bulge may shrink or disappear. If you notice a soft bulge in the groin or scrotum that changes in size, it is advisable to arrange a clinic visit so that a physician can confirm the cause.
When is immediate medical care needed?
In a small number of cases, bowel can become trapped in the hernia sac and cannot be pushed back. This is called intestinal incarceration and requires immediate treatment. Warning signs include:
- A bulge that becomes tense and swollen and cannot be pushed back
- Persistent crying from pain that is difficult to soothe
- Vomiting, reduced appetite, or lower activity levels
If intestinal incarceration is not treated promptly, the trapped segment of bowel may be damaged when its blood supply is obstructed. If any of these warning signs appear, go directly to the emergency department rather than waiting for a clinic appointment.
How is the timing of treatment decided?
Apart from a small number of newborns whose hernia opening is small enough that it may close on its own before age one, the great majority of pediatric hernias do not heal on their own and require surgery. Timing is determined mainly by whether a baby's heart and lung function has matured enough for anesthesia. A common point of assessment is whether the child weighs about 5–6 kilograms. If there is no emergency such as intestinal incarceration, surgery can also be considered after the child turns one. The actual timing still needs to be decided jointly by the physician and anesthesiologist.
It is not uncommon for the same child to have hernias on both sides. If bilateral hernias are confirmed before surgery, they can be addressed in the same operation rather than in two separate procedures.
How does pediatric hernia surgery differ from adult surgery?
The principles of pediatric hernia surgery differ from those of adult surgery. In adults, hernia surgery usually requires exposing the spermatic cord and separating the hernia sac from the spermatic cord and muscle tissue. In children, the spermatic cord does not need to be handled; the hernia sac is addressed on its own, with less effect on surrounding muscle tissue. Incision size and operating time vary with the individual's anatomy, the physician's experience, and the available instruments. In this center's usual experience, the incision is kept to about one centimeter or less and the operation takes about 7–10 minutes, with the aim of minimizing tissue disruption and anesthesia time. The actual details may vary slightly with each child's condition.
Assessment for coexisting undescended and retractile testes
During surgery, the physician will also check for an undescended testis, in which the testis has not descended normally into the scrotum, or a retractile testis, in which a stronger cremasteric reflex pulls the testis upward toward the groin. If an undescended testis is not treated before age one, the higher temperature in the abdomen may affect future sperm production. Retractile testes are more common in boys around preschool age and beyond; when necessary, they can be assessed and addressed during the same operation. Whether they should be managed at the same time still requires a physician's preoperative assessment.
Anesthesia
Pediatric hernia surgery commonly uses mask inhalational general anesthesia combined with local anesthesia. Compared with conventional intubated general anesthesia, mask inhalation causes less airway irritation and may reduce risks related to intubation, such as laryngospasm. The anesthetic method still needs to be determined by a pediatric anesthesiologist according to the child's individual circumstances, including heart and lung function and any congenital conditions.
Common questions about postoperative care
- Will crying cause the wound to open? The method of wound closure takes into account children's greater activity levels. Ordinary crying and normal activity generally do not affect wound healing, but follow your physician's instructions to avoid vigorous jumping, heavy lifting, and similar activities.
- When can my child bathe? The timing depends on the physician's postoperative instructions. In most cases, normal cleaning can resume once wound care is stable; follow the operating surgeon's advice.
- Are there dietary restrictions during recovery? A normal everyday diet can generally continue. Any specific restrictions will be explained by the physician or anesthesiologist before or after surgery.
Key takeaways
- Pediatric hernias are usually congenital, resulting from incomplete closure of the inguinal canal, and occur in about 7% of children in Taiwan.
- Crying and straining make a bulge more noticeable; they do not cause the hernia.
- Except for a small number of newborns with a small hernia opening that may close on its own, most cases need surgical treatment.
- The timing of surgery depends chiefly on whether heart and lung function and body weight are suitable for anesthesia.
- Pediatric surgery differs from adult surgery and does not require handling the spermatic cord.
- An undescended or retractile testis can be assessed at the same time when appropriate.
For a broader overview of adult hernia consultations and questions parents commonly raise, see our hernia surgery overview.
