Yes, allergies have a strong hereditary component, though genetics alone don’t determine whether a child will develop allergies. What’s inherited is a general predisposition toward allergic disease, often called atopy, rather than a specific allergy to a specific substance. A parent with a peanut allergy doesn’t necessarily pass down peanut allergy specifically, but they may pass down an increased likelihood that their child develops some form of allergic condition, whether that’s food allergy, eczema, asthma, or environmental allergies.
Research consistently shows that children with one allergic parent have a meaningfully higher risk of developing allergic disease than children with no family history, and that risk increases further when both parents are allergic. Twin studies have also demonstrated higher concordance rates for allergic conditions in identical twins compared to fraternal twins, reinforcing that genetics play a real and measurable role.
That said, genetics is only part of the picture. Rates of allergic disease have risen substantially over the past few decades, far faster than genetic changes in the population could explain. This points to environmental and lifestyle factors interacting with genetic predisposition, rather than genetics acting alone.
The Atopic March
Allergic conditions often don’t appear in isolation. Many children follow a pattern known as the atopic march, in which one allergic condition tends to precede and increase the risk of others over time.
The typical progression often looks like this:
- Eczema in infancy, frequently the earliest sign of an atopic tendency
- Food allergies developing in early childhood, often overlapping with eczema
- Asthma developing in early to mid-childhood
- Environmental allergies and allergic rhinitis emerging later in childhood or adolescence
Not every child follows this exact sequence, and not every child with one atopic condition develops the others. But the pattern is common enough that a child with early, severe eczema is often flagged for closer monitoring of food allergy and asthma risk down the line.
What Increases Hereditary Allergy Risk?
Family history:
- One allergic parent roughly doubles a child’s risk of developing an allergic condition compared to children with no family history
- Two allergic parents further increase that risk, and the risk is generally higher still when both parents share the same type of allergic condition
- A parent with asthma specifically increases a child’s risk of asthma more than a parent with, for example, isolated environmental allergies
Specific genetic factors:
Certain gene variants have been linked to specific allergic conditions. Filaggrin gene mutations, for example, are strongly associated with eczema and, through skin barrier dysfunction, may increase the risk of food sensitization through the skin early in life. Other genes influence how the immune system regulates IgE production and broader inflammatory responses.
Environmental and early-life factors:
Genetics sets the stage, but a range of environmental exposures appear to influence whether that predisposition becomes an actual allergic condition, including early-life exposure to allergenic foods, exposure to microbes and environmental diversity in infancy, and the timing and route of first exposure to potential allergens.
Can Hereditary Allergy Risk Be Reduced?
For families with a strong allergic history, a few evidence-based strategies are worth discussing with an allergist, particularly around infant feeding.
- Early, rather than delayed, introduction of common allergenic foods like peanut and egg in infancy has been shown in major clinical trials to reduce the risk of food allergy development, especially in infants with eczema or an existing food allergy who are at higher baseline risk
- Proactive management of eczema in infancy may help reduce the risk of subsequent food sensitization, given the role of skin barrier function in early allergic sensitization
- There is no current way to prevent allergic disease from developing entirely in a genetically predisposed child, but early, informed intervention can meaningfully change the trajectory in some cases
Families with a history of severe food allergy, especially where a sibling has already been diagnosed, are often good candidates for early allergist involvement rather than waiting for symptoms to appear.
When to See an Allergist
If you have a strong family history of allergies, asthma, or eczema and are planning a family, expecting a child, or already have a child showing early signs like eczema or a reaction to a food, it can be worth discussing your family’s allergic history with an allergist. This is especially true if a sibling has already been diagnosed with a food allergy, since that meaningfully raises risk for subsequent children.
Our allergists can review your family history, discuss evidence-based approaches to allergen introduction, and help build a monitoring plan appropriate for your child’s individual risk. Book an appointment online or call (212) 686-6321.
Frequently Asked Questions
If I have allergies, will my child definitely have them too?
Not definitely, but the risk is meaningfully higher than in the general population. Having one allergic parent roughly doubles a child’s risk, and having two allergic parents raises it further, but many children of allergic parents never develop allergic disease themselves.
Do children inherit the exact same allergy as their parent?
Not usually. What tends to be inherited is a general predisposition toward allergic disease rather than a specific allergy to a specific substance. A parent with a shellfish allergy might have a child who develops eczema or environmental allergies instead, rather than the same shellfish allergy.
Can allergies skip a generation?
They can appear to, since inheritance of allergic predisposition isn’t as simple or predictable as some single-gene conditions. A grandparent’s allergic history can still be relevant to a grandchild’s risk, even if the child’s own parents show no signs of allergic disease.
Does breastfeeding prevent allergies in high-risk babies?
The evidence here is mixed, and breastfeeding shouldn’t be relied on alone as an allergy prevention strategy. Early introduction of allergenic foods around 4 to 6 months, rather than delayed introduction, has the stronger evidence base for reducing food allergy risk in high-risk infants.
Should I avoid peanuts during pregnancy if I have allergies?
Current guidance does not recommend avoiding common allergenic foods during pregnancy to prevent allergies in your child. Stronger evidence supports early introduction of allergenic foods to the infant, typically starting around 4 to 6 months, rather than maternal avoidance during pregnancy or breastfeeding.