Is Hereditary Hemorrhagic Telangiectasia contagious?

TL;DR: Hereditary Hemorrhagic Telangiectasia (HHT) is not contagious; it is a genetic condition caused by mutations in specific genes, not by a virus, bacteria, or other infectious agent. You cannot contract Hereditary Hemorrhagic Telangiectasia through physical contact, sharing space, or any other form of interaction with someone who has the condition.

What is the actual cause of Hereditary Hemorrhagic Telangiectasia?

Hereditary Hemorrhagic Telangiectasia, also known as Osler-Weber-Rendu syndrome, is an autosomal dominant genetic disorder. It is caused by mutations in genes involved in the development of blood vessels, most commonly ENG (endoglin), ACVRL1 (ALK1), or SMAD4. Because it is a genetic condition, it is present from birth, though symptoms may not manifest until later in life. It is fundamentally a structural issue with how blood vessels form and connect, rather than a disease caused by an external pathogen.

Why is there sometimes confusion regarding contagion?

Because Hereditary Hemorrhagic Telangiectasia often involves visible symptoms like telangiectasias (small, spider-like red marks on the skin) or frequent nosebleeds (epistaxis), observers who are unfamiliar with the condition may mistakenly assume these symptoms are the result of an infection or a contagious skin condition. Furthermore, because the word "Hereditary" is in the name, some people mistakenly conflate "hereditary" with "communicable." It is important to clarify that while the condition is passed down from parent to child, it is impossible for a person to "catch" Hereditary Hemorrhagic Telangiectasia from a peer, family member, or partner.

Is it safe to live with or touch someone who has Hereditary Hemorrhagic Telangiectasia?

Yes, it is completely safe. There is zero risk of transmission when living with, touching, or being in close proximity to an individual with Hereditary Hemorrhagic Telangiectasia. The condition does not involve any infectious biological material. In the DiseaseMaps.org community, where 141 people with Hereditary Hemorrhagic Telangiectasia have connected, members emphasize that the social isolation caused by misunderstandings about contagion can be more damaging than the physical symptoms themselves. Being supportive and informed is the best way to help those living with this diagnosis.

Are there environmental triggers for the condition?

While Hereditary Hemorrhagic Telangiectasia is strictly genetic, certain environmental factors can exacerbate symptoms:

• Physical Trauma: Minor injuries or irritation to the nasal mucosa can trigger severe nosebleeds.


• Dry Air: Low humidity environments can dry out the nasal passages, making the fragile blood vessels more prone to rupture.


• Blood Thinners: Medications like aspirin or anticoagulants can increase the frequency and severity of bleeding events in patients with Hereditary Hemorrhagic Telangiectasia.


• High Blood Pressure: Uncontrolled hypertension can place additional stress on malformed blood vessels, increasing the risk of hemorrhaging.

Next steps

• Consult with a specialist physician, such as a geneticist or a hematologist, if you are concerned about your own genetic risk for Hereditary Hemorrhagic Telangiectasia.


• Visit the Cure HHT foundation website to access high-quality patient education materials that can be shared with family, friends, or schools to dispel myths about contagion.


• Join the DiseaseMaps.org community to connect with other patients and caregivers who understand the lived experience of managing this condition.


• Request a referral to an HHT Center of Excellence for specialized care and screening for potential internal arteriovenous malformations.

Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Hereditary Hemorrhagic Telangiectasia.


• Orphanet: Rare Disease Database (ORPHA: 774).


• Cure HHT: The International Foundation for HHT.


• OMIM (Online Mendelian Inheritance in Man): Entry #187300.