Hirschsprung’s disease is a congenital condition where nerve cells are missing from part of the large intestine, preventing it from pushing stool through normally. It affects roughly 1 in 5,000 newborns, with boys diagnosed about four times more often than girls. The condition is present at birth and is almost always identified in the first days or months of life, though milder cases occasionally go undetected until later in childhood.
What Happens in the Gut
Your digestive tract is lined with its own nervous system, sometimes called the “second brain,” containing 400 to 600 million nerve cells organized into clusters called ganglia. These ganglia coordinate the wave-like muscle contractions that move food and waste through the intestines. In Hirschsprung’s disease, these nerve cells never develop in a portion of the colon.
The problem starts during fetal development. Nerve cell precursors normally migrate from the top of the gut all the way down to the end of the colon. In babies with Hirschsprung’s disease, this migration stops too early, leaving the final stretch of the intestine without any nerve cells. Because the migration moves top-to-bottom, the affected segment always includes the rectum and extends upward for a variable distance. In about 80% of cases, only the last portion of the colon is involved. In rarer, more severe forms, a much longer segment or even the entire colon lacks nerve cells.
Without those nerve cells, the affected section of bowel can’t relax or contract properly. It essentially stays clamped shut, creating a blockage. Stool backs up behind it, and the healthy intestine above stretches and swells as it tries unsuccessfully to push contents through.
Early Signs in Newborns
The most common early clue is a newborn who doesn’t pass their first stool (meconium) within 48 hours of birth. Healthy full-term babies almost always pass meconium in this window. A delay beyond 48 hours raises suspicion, though only about half of newborns with Hirschsprung’s disease show this specific sign.
Other classic features include a visibly swollen abdomen, green or bile-colored vomiting, fever, dehydration, and lethargy. In some infants, the stretched intestinal loops are visible through the skin of the belly. Together, these signs in a newborn with a normal-appearing anus are strongly suggestive of Hirschsprung’s disease. Some children with short-segment disease present later in infancy or early childhood with stubborn constipation that doesn’t respond to typical treatments.
How It’s Diagnosed
A rectal biopsy is the gold standard for confirming the diagnosis. A small tissue sample is taken from the rectum, and a pathologist examines it under a microscope for the presence or absence of ganglion cells. If no ganglion cells are found, the diagnosis is confirmed.
Before a biopsy, doctors often use other tests to build their suspicion. A contrast enema, where dye is inserted into the rectum and X-rays are taken, can reveal the characteristic pattern of a narrow aganglionic segment with a ballooned-out section above it. This test has a sensitivity of about 79% and a specificity around 80%, meaning it catches most cases but isn’t reliable enough on its own. A pressure-sensing test called anorectal manometry, which measures how the muscles around the rectum respond to being stretched, performs somewhat better with about 94% sensitivity and 89% specificity. But neither replaces the biopsy, which remains the definitive answer.
Genetics and Associated Conditions
Hirschsprung’s disease has a strong genetic component. The most important gene involved is called RET, which plays a key role in nerve cell migration during fetal development. Mutations in RET account for roughly 50% of familial cases (where the condition runs in the family) and about 20% of cases that appear without a family history. Children with longer affected segments are more likely to carry RET mutations, found in about 24% of severe cases compared to 15% of short-segment cases.
Down syndrome is the most common associated condition. About 7% of children diagnosed with Hirschsprung’s disease also have Down syndrome. When both conditions are present together, the picture tends to be more complicated: rates of bowel inflammation before and after surgery are higher, functional outcomes are generally poorer, and the risk of serious complications increases.
Surgical Treatment
Surgery is the only definitive treatment. The goal is to remove the section of bowel that lacks nerve cells and connect the healthy, functioning intestine to the anus. This is called a pull-through procedure, and there are three main approaches surgeons use.
The Swenson procedure was the first technique developed. It removes the entire aganglionic segment down through the rectum and directly connects the normal colon to the low rectum. The Duhamel procedure takes a slightly different approach, coming in from behind the rectum and leaving part of the aganglionic rectum in place while connecting healthy bowel alongside it. The Soave (endorectal) procedure strips out the inner lining of the aganglionic rectum and pulls healthy colon down through the remaining muscular sleeve.
In very sick newborns or those with significant bowel inflammation, surgeons may first create a temporary ostomy, diverting stool to a bag on the abdomen to let the child stabilize before performing the definitive pull-through weeks or months later. Many centers now perform single-stage pull-through procedures in stable infants, sometimes using minimally invasive techniques.
Enterocolitis: The Most Serious Complication
Hirschsprung-associated enterocolitis is a potentially dangerous inflammation of the bowel that can occur both before and after surgery. It develops in roughly 24% of patients before their pull-through and about 21% afterward. Symptoms include sudden abdominal swelling, explosive diarrhea, fever, and lethargy. In severe cases, it can progress to sepsis. Treatment typically involves intravenous antibiotics and rectal irrigations (washouts) to decompress the bowel. Parents of children with Hirschsprung’s disease learn to recognize these warning signs early, because prompt treatment makes a significant difference in outcomes.
Long-Term Bowel Function
Surgery corrects the obstruction, but many patients experience ongoing bowel challenges that improve gradually over years. Fecal soiling, where small amounts of liquid or soft stool leak out, is the most common long-term issue, affecting up to 50% of adult patients to some degree. For most, it’s mild and infrequent. About 10% of adults deal with more significant soiling that happens at least weekly or requires protective pads. A large Dutch study of 346 patients found that any form of fecal incontinence affected 65% of children but dropped to 29% by adulthood, showing clear improvement with time.
Chronic constipation is the other major long-term concern, affecting 30% to 40% of adults who had certain types of pull-through procedures, though it’s less common after the endorectal (Soave) approach. Some patients swing between periods of constipation and looser stools, and managing this balance becomes a routine part of life.
Quality of Life Into Adulthood
Adults who had Hirschsprung’s disease repaired in childhood report physical functioning on par with the general population. They can work, exercise, and manage daily activities without significant physical limitation. The picture is more nuanced when it comes to mental health: rates of depression and anxiety are higher in this group than in the general population, regardless of how severe the original disease was. About 30% of adults report that bowel symptoms affect their social lives in some way.
Sexual health can also be affected. Roughly 18% of adult men report some degree of erectile difficulty, and a smaller percentage have concerns about ejaculation. Women with a history of Hirschsprung’s disease report lower sexual quality of life and may have more difficulty conceiving, possibly due to pelvic adhesions from childhood surgery. In both men and women, sexual quality of life is closely tied to how well bowel function is managed, reinforcing that ongoing bowel care matters well beyond childhood.