Early Warning Signs of HAE Attacks Caregivers Should Know

Learn the signs and symptoms that could signal an impending episode of HAE.

woman having stomach pain, stomach cramps

People with hereditary angioedema (HAE) often need help from a caregiver.

In many cases, caregivers are family members, but a caregiver can be any friend or loved one who is able to provide help and support.

A caregiver may help with administering medications, helping with chores or errands, and communicating with healthcare providers. Caregivers can also be an important source of emotional support—something that is essential when living with a chronic and complicated condition like HAE.

Whatever role a caregiver fulfills, it’s important to have a good understanding of HAE and what is happening in the body when a person has HAE.

People who have HAE experience recurring episodes or attacks of severe inflammation that can affect any part of the body—including the throat and airways, a potentially life-threatening situation that requires emergency medical treatment.

If you are acting as a caregiver for someone with HAE, below is some essential information to understand about HAE attacks.

When do HAE attacks occur?

Episodes of acute hereditary angioedema do not follow a pattern and can be difficult to predict. The areas of the body affected, the severity of symptoms, and the duration of symptoms vary from person to person, and episode to episode. Some people experience attacks more frequently than others.

While symptoms do not follow a predictable pattern, some patients report experiencing specific symptoms in the hours or days before an HAE attack begins. These include:

  • Fatigue
  • Muscle aches
  • Non-itching red rash
  • Tingling in the area that will be affected
  • Irritability or changes in mood
  • Abdominal pain, nausea and other gastrointestinal symptoms

It is not yet known how common or frequent these symptoms are in patients with HAE. Like other HAE symptoms, these vary between patients, and are not considered a reliable way to predict attacks.

However, in at least one study, a large percentage of people with HAE reported they could feel when an attack was in the near future.

What can trigger an HAE attack?

Though most HAE episodes are not correlated with any identifiable trigger, some episodes are triggered by specific events. A list of known possible triggers for HAE episodes includes:

  • Mental stress
  • Physical exertion
  • Surgery
  • Dental procedures
  • Minor traumas
  • Illness (for example, the flu)

Certain medications may also cause more frequent HAE attacks and more severe symptoms. These include medications that contain estrogen, such as oral contraceptives and hormone replacement therapy, and ACE inhibitors, a medication used to treat high blood pressure.

Women with HAE also report more frequent HAE episodes during menstruation, during pregnancy, and while breastfeeding.

Preventing HAE attacks

Treatment for HAE falls into two broad categories—therapies that prevent attacks from occurring (these are called prophylactic therapies) and therapies that reverse attacks when they occur (called rescue therapies).

Preventive treatments can be either short term or long term. Short-term preventive treatments may be prescribed prior to a surgery or dental work.

Long-term preventive treatments are taken regularly to prevent attacks from occurring and to reduce the severity of attacks that do occur.

Some preventive treatments are administered by a healthcare provider. Others can be self-administered or administered by a caregiver.

Treating HAE attacks

There are a number of treatments taken to reverse acute attacks when they occur. Again, some are administered by a healthcare provider, while others can be self-administered or administered by a caregiver.

Another reason why caregivers should be aware of the signs, symptoms, and potential triggers—HAE attacks should be treated as early as possible. Early treatment can reduce the severity of the attack and the duration of the attack.

Article sources open article sources

Jose Granero-Molina, Francisco Sanchez-Hernandez, et al. "The Diagnosis of Hereditary Angioedema: Family Caregivers’ Experiences." Clinical Nursing Research, 2018. Vol. 29, No. 2.
Peter J. Delves. "Hereditary and Acquired Angioedema." Merck Manual. October, 2020.
Know HAE. "What is hereditary angioedema?"
Jenna Fletcher. "What to know about hereditary angioedema attacks." MedicalNewsToday. December 3, 2020.
J.G. Gibbs and T.J. Craig. "Prodromal Symptoms Before Exacerbations of Hereditary Angioedema." The Journal of Allergy and Clinical Immunology, 2007. Vol. 119, No. 1.
Michael J. Prematta, Againdra K. Bewtra, et al. "Per-Attack Reporting of Prodromal Symptoms Concurrent with C1-Inhibitor Treatment of Hereditary Angioedema Attacks." Advances in Therapy, 2012. Vol. 29.
Zsuzsanna Zotter, Dorottya Csuka, et al. "The influence of trigger factors on hereditary angioedema due to C1-inhibitor deficiency." Orphanet Journal of Rare Diseases, 2014. Vol. 9.
U.S. Hereditary Angioedema Association. "Triggers: What Causes Hereditary Angioedema Attacks?"
Laurence Bouillet. "Hereditary angioedema in women." Allergy, Asthma & Clinical Immunology, 2010. Vol. 6, No. 1.
Hannah Duffey and Rafael Firszt. "Management of acute attacks of hereditary angioedema: role of ecallantide." Journal of Blood Medicine, 2015. Vol. 6.
U.S. Hereditary Angioedema Association. "Approved HAE Treatments."
Hilary Longhurst. "Optimum Use of Acute Treatments for Hereditary Angioedema: Evidence-Based Expert Consensus." Frontiers in Medicine, 2018.

Featured Content


5 Resources for People with HAE

Where to learn more about hereditary angioedema, including patient education and support groups.

Finding the Words: Talking to Your Doctor About HAE

Talking to your doctor about HAE can be difficult. Dr. Jennifer Caudle offers tips on how to make the process easier.

How Stress Affects Hereditary Angioedema

Learn how physical and mental stress may impact hereditary angioedema, and ways you can reduce stress.

6 Questions to Ask Your Doctor About HAE Attacks

Preventing HAE attacks, avoiding triggers, and when to seek emergency treatment.


Preventive Therapy versus Rescue Therapy for HAE

Treatment for hereditary angioedema focuses on preventing attacks as well as treating attacks when they occur.