Will My Next Child Have Hirschsprung Disease?

Whether you are a parent who just had a baby with Hirschsprung disease, or you are an adult with the condition planning your own family, it is natural to worry about the risks for future children. Learning that your child could inherit a condition requiring surgery can feel overwhelming and scary.

In general, the overall familial recurrence risk for Hirschsprung disease is approximately 7.6% ^[1]. However, this number is just an average. Your actual risk could be significantly lower or higher depending on several factors, including the sex of the affected person, how much of their colon is affected, and your family’s specific genetic profile ^[2][1].

Note: The statistics in this guide apply to isolated Hirschsprung disease. If the disease is part of a broader genetic condition (like Down syndrome or Waardenburg syndrome), the recurrence risks are different and depend on the underlying syndrome ^[1].

How Sex and Segment Length Affect Your Risk

The recurrence risk fluctuates based on a concept known as “genetic load.” When a condition is less common in a specific group, it usually takes a stronger genetic load for it to appear. Because this genetic load is stronger, the chance of passing it on is higher ^[3][2].

Here is how that applies to Hirschsprung disease:

• Sex: Hirschsprung disease is much more common in males. Because it is less common in females, a female with the disease usually carries a stronger genetic predisposition. Therefore, if the affected family member is female, the risk for future children (especially boys) is higher ^[2][1].
• Segment Length: Most people have short-segment disease, which is confined to the very end of the bowel. If the affected person has long-segment disease or total colonic aganglionosis (where the entire large intestine is affected), the genetic link is much stronger, which increases the recurrence risk ^[2][4].

Estimated Sibling Recurrence Risks

To help put these factors into perspective, researchers have estimated sibling risks for isolated Hirschsprung disease based on the affected child’s sex and segment length ^[2]:

If You Are an Adult with Hirschsprung Disease

If you are an adult who has Hirschsprung disease, the exact same rules of genetic load apply to you. Research shows that parent-to-child transmission accounts for about 22% of familial cases ^[4].

The most common genetic cause of Hirschsprung disease is a mutation in the RET gene ^[3][1]. Interestingly, this gene shows incomplete penetrance, meaning a person can carry the mutation and pass it on without ever having symptoms themselves ^[3][1]. The penetrance of RET mutations is about 56% ^[1].

If a parent carries a disease-causing RET mutation, the risk of their future children inheriting the mutation and developing the disease is calculated at roughly 28%. This 28% risk applies regardless of whether you just carry the gene silently or if you actually have the disease yourself ^[1].

Family Planning Next Steps

Because the risk can vary so widely, standard guidelines strongly recommend genetic counseling for any family dealing with Hirschsprung disease, especially in long-segment or total colonic cases ^[4].

A genetic counselor will review your family history and likely recommend genetic testing. This usually involves a simple blood draw or cheek swab. While they will definitely look at the RET gene, they may use a “gene panel” to check multiple genes (like EDNRB) associated with the disease ^[5][6]. Testing affected individuals and parents can determine if the mutation was inherited or happened randomly (de novo), giving you a highly accurate recurrence risk tailored to your specific family ^[7][5].