Hirschsprung Disease

What is Hirschsprung disease?

Hirschsprung disease is a birth defect of the large intestine (the colon and rectum) in which certain nerve cells are missing from the wall of the bowel. These nerve cells, called ganglion cells, normally form a network that tells the muscles of the intestine to squeeze and relax in waves. This rhythmic squeezing, known as peristalsis, is what pushes stool along and out of the body. In Hirschsprung disease, the part of the bowel that lacks these nerve cells cannot relax and stays tightly contracted. Stool builds up behind the narrowed section, and the bowel above it stretches and becomes enlarged.

The condition is present from birth, although it is not always recognized right away. In most children the affected segment is limited to the rectum and the lower part of the colon. This is often called short-segment disease. In a smaller number of children a longer stretch of the colon, or in rare cases the entire colon and even part of the small intestine, is affected. This is called long-segment or total colonic disease.

Hirschsprung disease is uncommon. It occurs more often in boys than in girls, and it is more frequent in children who have certain genetic conditions, particularly Down syndrome. Most children are diagnosed as newborns or during the first months of life, but milder cases are sometimes not identified until later in childhood. Care is usually coordinated by a pediatric surgeon working alongside pediatric gastroenterologists (doctors who specialize in the digestive system in children). At Acibadem, this condition is managed within the Pediatric Surgery department.

Hirschsprung disease symptoms

Hirschsprung disease symptoms depend on how much of the bowel is affected and on the age of the child when the problem becomes noticeable. Because the underlying issue is a blockage of stool, most symptoms relate to constipation and an obstructed bowel.

In newborns, common signs include:

• Failure to pass meconium (the first dark, sticky stool) within the first 48 hours after birth
• A swollen, firm or distended belly
• Vomiting, which may be green or brown
• Poor feeding or refusal to feed
• Explosive passage of stool and gas after a doctor performs a rectal examination
• Fever, lethargy or a generally unwell appearance, which may signal infection

In infants and older children with milder or shorter-segment disease, the picture may be less dramatic and can include:

• Chronic, severe constipation that does not respond well to usual treatments
• Thin, ribbon-like stools
• A persistently swollen abdomen
• Poor weight gain or slow growth
• Fatigue and irritability
• Episodes of foul-smelling diarrhea, which can be a warning sign of bowel infection

One of the most serious complications is Hirschsprung-associated enterocolitis. Enterocolitis means inflammation and infection of the intestine. It can develop before or after surgery and may cause fever, a swollen and painful belly, vomiting, watery or bloody diarrhea, and signs of dehydration. This complication can become life-threatening quickly, so families are usually taught to recognize its early signs.

It is important to know that ordinary constipation in babies and toddlers is very common and is usually not caused by Hirschsprung disease. Doctors become more concerned when constipation begins in the first weeks of life, when meconium was delayed, or when the child is not growing well.

Causes and risk factors

Hirschsprung disease causes trace back to early development in the womb. During pregnancy, nerve cells that will control the bowel travel from the developing nervous system down the length of the intestine. In Hirschsprung disease this migration stops early, so the lowest part of the bowel is left without ganglion cells. The segment that is missing nerve cells is described as aganglionic. Exactly why this migration stops is not fully understood, but genetics appear to play an important role.

Several factors are known to raise the likelihood of the condition:

• Family history. Having a parent or sibling with Hirschsprung disease increases the chance that a child will be affected, especially when a relative had long-segment disease.
• Being male. The condition is diagnosed more often in boys than in girls.
• Down syndrome. Children with Down syndrome have a clearly higher risk than the general population.
• Other genetic conditions. Certain inherited syndromes that affect nerve development, such as some forms of multiple endocrine neoplasia and Waardenburg syndrome, are associated with Hirschsprung disease.
• Gene changes. Variants in several genes involved in nerve cell growth and migration, including the RET gene, have been linked to the condition.
• Other birth defects. Hirschsprung disease sometimes occurs together with heart defects, kidney or urinary tract abnormalities, or other anomalies of the digestive system.

Nothing a parent does during pregnancy is known to cause Hirschsprung disease. It is not caused by diet, feeding choices or how a baby is cared for after birth.

Hirschsprung disease diagnosis

Hirschsprung disease diagnosis begins with a careful history and physical examination. A doctor will ask when the first stool was passed, how the child feeds, and how the bowel pattern has changed. During the examination the abdomen is checked for swelling, and a gentle rectal examination may be performed. In Hirschsprung disease the rectum often feels tight and empty, and withdrawing the examining finger may be followed by a sudden release of gas and stool.

If the condition is suspected, doctors use one or more of the following tests to confirm it:

• Abdominal X-ray. A plain X-ray can show loops of bowel that are filled with gas and stool, suggesting a blockage.
• Contrast enema. A liquid that shows up on X-ray is placed gently into the rectum, and images are taken. In Hirschsprung disease the narrow, aganglionic segment often appears small while the bowel above it looks stretched. The point where the bowel changes from narrow to wide is called the transition zone. This test can help estimate how much bowel is affected, although it is not always conclusive in newborns.
• Anorectal manometry. A small balloon is placed in the rectum and inflated to measure how the muscles at the anus respond. In a healthy bowel the internal sphincter muscle relaxes when the rectum is stretched. In Hirschsprung disease this relaxation reflex is absent. This test is used mainly in older infants and children who can cooperate.
• Rectal biopsy. This is the definitive test. A tiny sample of tissue is taken from the lining of the rectum, often through a suction device at the bedside in newborns, or under anesthesia in older children. A pathologist examines the sample under a microscope. The absence of ganglion cells, usually together with abnormally thickened nerve fibers, confirms the diagnosis. Special stains may be used to make the findings clearer.

Once the diagnosis is confirmed, blood tests may be ordered to check for infection and dehydration, and genetic testing or evaluation for associated conditions may be recommended in some families. The exact length of the affected segment is often determined at the time of surgery, when the surgeon takes further biopsies to find where normal nerve cells begin.

Hirschsprung disease treatment options

Hirschsprung disease treatment almost always involves surgery, because the aganglionic bowel cannot be made to work with medicine alone. The goal of surgery is to remove or bypass the segment that lacks nerve cells and to connect healthy, normally functioning bowel to the anus so that the child can pass stool.

Initial stabilization. Before any operation, a child who is unwell may need intravenous fluids, antibiotics to treat or prevent enterocolitis, and a period of not feeding by mouth. Rectal irrigations, in which warm saline is gently flushed into the rectum through a soft tube to wash out stool and gas, are commonly used to decompress the bowel. Parents are often taught how to perform irrigations at home while waiting for surgery.

Pull-through surgery. The main operation is known as a pull-through procedure. The surgeon removes the diseased segment and brings, or pulls, the healthy bowel down to join it to the anus, preserving the muscles that control continence. Several surgical techniques exist, and they are known by the names of the surgeons who developed them. Many are performed through the anus itself, sometimes with the help of laparoscopy (keyhole surgery using a small camera through the abdomen), which may avoid a large incision. The choice of technique depends on the child’s age, health, and how much bowel is involved, and your surgeon can explain the reasoning for a particular approach.

Staged surgery with a stoma. In some situations, such as severe enterocolitis, a very enlarged bowel, long-segment disease, or a very small or premature baby, the operation is done in stages. First, the surgeon creates an ostomy, an opening in the abdominal wall through which the healthy part of the bowel drains stool into a bag. This allows the bowel to rest and recover. The pull-through is performed later, and the ostomy is closed either at that time or in a further operation.

Care after surgery. Recovery in the hospital usually lasts several days. Feeding is restarted gradually. For a period after the operation the anus may need to be gently stretched with dilators to prevent the new connection from narrowing; the care team will show families how to do this if it is needed. Regular follow-up is important to watch for constipation, soiling, and enterocolitis.

Managing long-term bowel function. Even after a successful operation, many children need ongoing help with bowel control. Depending on the problem, treatment may include dietary adjustments, stool softeners or laxatives for constipation, medicines that slow the bowel for loose stools, scheduled toileting, and, in some cases, regular enemas or irrigations. A small number of children with persistent problems may benefit from botulinum toxin injections into the anal sphincter to help it relax, or from further evaluation for a retained segment of abnormal bowel. Bowel-management programs run by specialized teams can be helpful for school-age children who struggle with soiling.

Living with Hirschsprung disease and outlook

With modern surgical care, most children with Hirschsprung disease survive and go on to lead active lives. However, the condition is not simply cured by surgery, and families should expect a period of adjustment and ongoing follow-up. The outlook depends on the length of bowel affected, whether other medical conditions are present, and how well complications are prevented and treated.

Common long-term concerns include constipation, fecal incontinence or soiling, and repeated episodes of enterocolitis. These problems are often most noticeable in the first years after surgery and tend to improve as children grow, although some continue to need support into adolescence. Children with total colonic disease have a more complex course and may have frequent loose stools, difficulty absorbing nutrients, and a higher need for nutritional support.

Practical points that many families find helpful include keeping a simple record of bowel movements, learning the early warning signs of enterocolitis, maintaining good hydration, and working with a dietitian when needed. School-age children may need a discreet plan with teachers for toilet access. Emotional support matters as well; bowel problems can affect a child’s confidence, and involving a psychologist or a support group is sometimes recommended. Regular review by the surgical and gastroenterology team allows problems to be picked up early and treatment adjusted over time.

Frequently asked questions

What are the first signs of Hirschsprung disease in a newborn?

The earliest sign in many babies is failure to pass meconium within the first one to two days of life, often together with a swollen belly, vomiting and poor feeding. Not every baby who passes meconium late has Hirschsprung disease, but doctors usually consider the diagnosis when these signs appear together, and they may order tests to check.

Can Hirschsprung disease be diagnosed in older children or adults?

Yes, although it is less common. Children with a short affected segment may have chronic constipation for years before the diagnosis is made. Rarely, the condition is first recognized in adolescence or adulthood in a person with lifelong severe constipation. The same tests, particularly rectal biopsy and anorectal manometry, are used at any age.

What causes Hirschsprung disease, and could it have been prevented?

Hirschsprung disease is caused by nerve cells failing to reach the lower bowel during development before birth. Genetic factors are thought to be the main influence, and the condition runs in some families. There is no known way to prevent it, and it is not related to anything a parent did or did not do during pregnancy.

Is surgery always needed for Hirschsprung disease treatment?

In nearly all cases, yes. The bowel segment without nerve cells cannot function, so medicines and diet alone cannot correct the blockage. Surgery removes or bypasses the affected segment. Non-surgical measures such as rectal irrigations are used to keep the child safe before the operation and sometimes to manage symptoms afterward.

Will my child have normal bowel control after Hirschsprung disease surgery?

Many children develop reasonable bowel control over time, but it often takes years, and some children continue to have constipation or soiling that needs treatment. Outcomes vary from child to child and depend on factors such as the length of bowel affected. Your care team can discuss what to expect based on your child’s individual situation.

What is enterocolitis and why is it dangerous in Hirschsprung disease?

Enterocolitis is inflammation and infection of the bowel that can occur when stool and bacteria build up in a poorly emptying intestine. In children with Hirschsprung disease it can develop rapidly, before or after surgery, and can lead to severe dehydration and serious illness. Fever, a swollen painful abdomen, vomiting and foul-smelling or bloody diarrhea need urgent medical attention.

How is Hirschsprung disease diagnosis confirmed?

The diagnosis is confirmed by a rectal biopsy, in which a small piece of tissue from the rectum is examined under a microscope for the absence of ganglion cells. Contrast enema X-rays and anorectal manometry provide supporting information and help estimate how much bowel is involved, but biopsy remains the standard for confirmation.

When to see a doctor

Any newborn who has not passed meconium within the first 48 hours of life, or who has a swollen belly and is vomiting, should be assessed by a doctor promptly. Older babies and children with constipation that began very early in life, that is unusually severe, or that is accompanied by poor growth should also be evaluated. If your child has already been diagnosed with Hirschsprung disease, seek emergency care immediately if you notice any of the following red-flag signs, which may indicate enterocolitis or a bowel obstruction:

• Fever, especially together with a swollen or tense abdomen
• Repeated vomiting, particularly if green, brown or bloody
• Explosive, watery, foul-smelling or bloody diarrhea
• A belly that is rapidly enlarging, hard or painful to touch
• Refusal to feed, extreme sleepiness, floppiness or unusual irritability
• Signs of dehydration such as few wet diapers, dry mouth, sunken eyes or no tears when crying
• No passage of stool or gas for an unusually long time despite the usual routine
• Bleeding, redness or discharge around a stoma or the surgical site

These symptoms can worsen quickly in a small child, so it is safer to be seen early rather than to wait and watch.