HAE and Pregnancy: What To Expect

Medically reviewed by Deborah Pedersen, M.D.

Written by Carrie Madormo, RN, MPH

Posted on July 21, 2026

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Key Takeaways

Many people with hereditary angioedema (HAE) wonder if they can safely become pregnant, and with the right planning, treatment, and monitoring, many people with HAE can have a healthy pregnancy and delivery.

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Many people with hereditary angioedema (HAE) wonder whether they can safely become pregnant. Although HAE is a lifelong condition, it doesn’t affect fertility. With appropriate planning, treatment, and monitoring, many people with HAE can have a healthy pregnancy and delivery.

HAE can be passed down through families. If you have HAE, each baby has a 50 percent chance of inheriting the condition.

In this article, we’ll cover what to expect during and after pregnancy when you have HAE, including possible changes in attacks and treatment options. We’ll also discuss ways to plan for pregnancy, delivery, and the postpartum period.

🗳️ How did pregnancy affect your HAE attacks?

They became more frequent.

They became less frequent.

They stayed about the same.

How Pregnancy Affects HAE Symptoms

Some people with HAE experience more frequent or severe attacks during pregnancy, while others have fewer or no attacks. The pattern may also differ with each pregnancy.

Hormonal changes during pregnancy, particularly increased estrogen levels, may contribute to more frequent or severe attacks. Physical injury and emotional stress may also trigger attacks.

Faint pink, ring-shaped rash with central clearing across the abdomen of a person with light skin. — Erythema marginatum is a rash that can appear in some people with hereditary angioedema, sometimes before a swelling attack.

A 2023 study of 88 pregnancies found that attack frequency increased in 67 percent of pregnancies. Attacks commonly affected the abdomen, arms, and legs, and abdominal attacks occurred more frequently during pregnancy than before pregnancy.

Fortunately, HAE attacks are rare during labor and delivery, and most people with HAE can safely give birth. If there’s no obstetric reason for a cesarean section (C-section), vaginal delivery is generally preferred. However, evidence about the best delivery and anesthesia approaches remains limited, so your plan should be based on your health history and obstetric needs.

People who breastfeed may experience more frequent HAE attacks after giving birth. Researchers have suggested that this may be related to higher levels of the hormone prolactin. Tell your healthcare team if you plan to breastfeed so they can recommend an appropriate treatment plan.

HAE Treatment Options During Pregnancy

If possible, review all your HAE medications with your healthcare team before becoming pregnant. Anabolic androgens, sometimes called anabolic steroids, such as danazol, oxandrolone, and stanozolol, are not recommended during pregnancy. Tranexamic acid is also generally not recommended for HAE during pregnancy.

Plasma-derived C1 inhibitor (C1INH) is generally the preferred treatment during pregnancy. In HAE types 1 and 2, it replaces missing or poorly functioning C1INH and helps limit excess bradykinin, a substance that drives swelling in these types of HAE.

C1INH may be used as on-demand treatment for a current attack or as preventive treatment to reduce future attacks. It’s commonly recommended because it has the most established safety experience during pregnancy and breastfeeding.

C1INH can be given intravenously (IV) or by subcutaneous injection. If C1INH is unavailable in the hospital, fresh frozen plasma (FFP, the liquid part of donated blood) may be used for an acute attack or short-term prevention.

Before a planned C-section, your healthcare team may give C1INH as a preventive treatment to reduce the risk of an attack. Regional anesthesia (medicine that numbs part of the body) is generally preferred over general anesthesia (medicine that makes you unconscious) when appropriate, because placing a breathing tube may trigger airway swelling. Your team should also have on-demand HAE treatment available in case an attack occurs.

Because HAE is rare, it’s important to work with healthcare professionals who understand the condition. Your team may include a primary care provider, an allergist or immunologist, and an obstetrician.

Planning a Healthy Pregnancy With HAE

If possible, talk with your healthcare provider before becoming pregnant. They can review your treatment plan and help you find an obstetrician who will work with your HAE specialist. You may also want to meet with a genetic counselor to discuss inheritance and testing options.

Fertility treatments, including in vitro fertilization (IVF), can cause hormonal fluctuations that may affect HAE attacks. Make sure you know your usual triggers and the early signs of an attack. This can help you recognize when you may need on-demand medication or medical care.

Preparing for Labor and Delivery

During prenatal appointments, create a birth plan with your healthcare team. Make sure you understand the plan and know whom to contact if you have questions or notice signs of an attack. Confirm which HAE medications will be available at the hospital and ask whether you should bring additional doses.

Preparing for Postpartum

HAE attacks are uncommon during labor and delivery, but their frequency or severity may increase during the postpartum period. Your healthcare team may recommend close monitoring for at least 72 hours after delivery.

Before leaving the hospital, make sure you have enough medication at home. Tell your healthcare team if you plan to breastfeed because this may affect which medications they recommend.

Once your baby is born, your healthcare provider will discuss the right time to test them for HAE. Many providers recommend waiting until the baby is at least 1 year old so blood test results are more accurate.