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Living with Hereditary angioneurotic edema

An inherited condition with repeated attacks of severe swelling of the skin and the linings of some organs.

Understanding Hereditary angioneurotic edema

Hereditary angioedema (HAE) is a condition with repeated attacks of severe swelling of the skin and mucous membranes.

Attacks often become more frequent after puberty. Swelling most often affects the face, hands, arms, legs, genitals, and buttocks. The gut can be affected, causing belly pain, nausea, vomiting, and diarrhea. Less often the upper airway is involved, which can be dangerous. Attacks usually go away on their own in 2 to 5 days. Triggers can include emotional stress, physical stress, and dental procedures.

Signs & symptoms

GARD doesn't list a symptom list for this condition, but the summary describes these signs:

  • Severe swelling of the skin
  • Swelling of the face, hands, and legs
  • Belly pain, nausea, and vomiting
  • Diarrhea
  • Swelling of the throat or tongue (less often)

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include autoimmune and inflammatory disease specialists, allergy and immune system specialists and genetic specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    US Hereditary Angioedema Association may keep lists of experts for this condition.

Care & treatment

Care team
autoimmune and inflammatory disease specialists (rheumatologists); Allergy and immune system specialists (allergists / immunologists); Genetic specialists (geneticists)
Expert care
Expert lists: US Hereditary Angioedema Association
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with US Hereditary Angioedema Association and other patient organizations
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Which gene change do I have, and should family members be tested?
What are my personal triggers, and how can I track them?
What is my plan for swelling in the throat or tongue?

Quick facts

Symptoms usually startany time in life
InheritanceAutosomal Dominant

HAE may be caused by changes in the SERPING1 (C1NH) gene or the F12 gene. In some cases the cause is not yet known. It is autosomal dominant, but not everyone with the gene change develops symptoms.

Genetic

Also known as: angioedemas, hereditary; c1 esterase inhibitor deficiency; familial angioneurotic edema; familial angioneurotic oedema; hae; hae - hereditary angioedema

Patient organizations

Source: NIH GARD · Hereditary angioneurotic edemaGARD ID 5979 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Hereditary angioneurotic edema.

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