Hereditary Hemorrhagic Telangiectasia

Symptoms

Common signs and symptoms of Hereditary Hemorrhagic Telangiectasia include:

Frequent nosebleeds that may be severe

Small red or purple spots on lips, tongue, or fingertips

Red spots inside the mouth or on the face

Shortness of breath during physical activity

Fatigue and weakness from chronic blood loss

Iron deficiency anemia

Stroke-like symptoms in young adults

Seizures or headaches from brain involvement

Chest pain or coughing up blood

Abnormal blood vessels visible on skin

Gastrointestinal bleeding

Enlarged liver or abdominal pain

When to see a doctor

If you experience severe or worsening symptoms, seek immediate medical attention. Always consult with a healthcare professional for proper diagnosis and treatment.

Causes & Risk Factors

Several factors can contribute to Hereditary Hemorrhagic Telangiectasia.

Hereditary Hemorrhagic Telangiectasia results from mutations in specific genes that control blood vessel development.

Hereditary Hemorrhagic Telangiectasia results from mutations in specific genes that control blood vessel development. The most common culprits are the ENG gene (causing HHT type 1) and the ACVRL1 gene (causing HHT type 2), though mutations in several other genes can also trigger the condition. These genes normally produce proteins that help regulate how blood vessels form and maintain their proper structure during development and throughout life.

When these genes malfunction, blood vessels develop abnormally, creating direct connections between arteries and veins.

When these genes malfunction, blood vessels develop abnormally, creating direct connections between arteries and veins. Think of it like a highway system where major roads connect directly without the smaller side streets that normally handle local traffic. In healthy blood vessels, tiny capillaries act like those side streets, allowing controlled exchange of oxygen and nutrients. Without this capillary network, blood flows directly from high-pressure arteries into low-pressure veins, creating fragile, enlarged vessels prone to bleeding.

The condition follows an autosomal dominant inheritance pattern, meaning only one faulty gene copy from either parent causes HHT in their child.

The condition follows an autosomal dominant inheritance pattern, meaning only one faulty gene copy from either parent causes HHT in their child. Each pregnancy carries a 50% risk of passing the condition to the next generation. However, the severity and specific symptoms can vary dramatically even within the same family, as other genetic and environmental factors influence how the condition manifests in each person.

Risk Factors

Having a parent with HHT or related symptoms
Family history of frequent nosebleeds
Genetic mutations in ENG, ACVRL1, or SMAD4 genes
Previous generations with unexplained strokes
Family members with lung or brain blood vessel problems
Relatives with characteristic skin lesions
European ancestry (slightly higher prevalence)
Family history of liver enlargement
Blood relatives with gastrointestinal bleeding

Diagnosis

How healthcare professionals diagnose Hereditary Hemorrhagic Telangiectasia:

1
Diagnosing HHT often begins when doctors notice a pattern of symptoms that seem unrelated at first glance.
Diagnosing HHT often begins when doctors notice a pattern of symptoms that seem unrelated at first glance. The Curacao criteria provide a standardized approach, looking for four key features: recurrent nosebleeds, characteristic small blood vessel lesions (telangiectasias), internal blood vessel malformations, and a family history of HHT. Having three or four of these criteria indicates a definitive diagnosis, while two criteria suggest possible HHT requiring further investigation.
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Genetic testing can confirm the diagnosis and identify the specific gene mutation responsible.
Genetic testing can confirm the diagnosis and identify the specific gene mutation responsible. Blood tests look for mutations in the ENG, ACVRL1, SMAD4, and other associated genes. This information helps predict which organs might be affected and guides family screening recommendations. However, genetic testing doesn't detect all cases, as some people have mutations in genes not yet identified or have mosaic patterns that are harder to detect.
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Comprehensive screening examines potentially affected organs even when symptoms aren't apparent.
Comprehensive screening examines potentially affected organs even when symptoms aren't apparent. This typically includes: - Contrast echocardiography to detect lung blood vessel malformations - Brain and spinal MRI to identify central nervous system lesions - CT scans of the chest and abdomen - Liver function tests and imaging - Complete blood counts to check for anemia Regular screening helps catch developing problems before they cause serious complications, making early detection and ongoing monitoring essential parts of HHT care.

Complications

The most serious complications of HHT involve internal blood vessel malformations that can cause sudden, life-threatening events.
Brain and spinal cord lesions carry risks of stroke, seizures, or neurological deficits, particularly in younger adults who might otherwise never expect such problems.
Pulmonary arteriovenous malformations can lead to strokes through paradoxical embolism, where blood clots bypass lung filtration, or brain abscesses from bacteria that would normally be filtered out by healthy lungs.
Chronic complications develop gradually but significantly impact quality of life.
Severe anemia from ongoing blood loss causes fatigue, weakness, and reduced exercise tolerance.
Liver involvement can progress to cirrhosis, portal hypertension, or heart failure from increased blood flow demands.
High-output heart failure may develop when large arteriovenous malformations force the heart to work harder to maintain adequate circulation.
Gastrointestinal bleeding, while often manageable, can become severe enough to require emergency intervention or frequent blood transfusions.

Prevention

Avoiding nose picking, aggressive nose blowing, and nasal trauma
Using humidifiers and saline sprays to keep nasal passages moist
Avoiding blood-thinning medications unless absolutely necessary
Getting prompt treatment for respiratory infections
Avoiding activities with high stroke risk if brain lesions are present
Maintaining good iron levels through diet and supplements

Treatment Approaches

Treatment for HHT focuses on managing symptoms and preventing complications rather than curing the underlying genetic condition.

Treatment for HHT focuses on managing symptoms and preventing complications rather than curing the underlying genetic condition. Nosebleed management often starts with simple measures like saline rinses, humidifiers, and gentle nose care techniques. When conservative approaches fail, treatments range from topical medications like estrogen gels to procedures such as laser therapy, electrocautery, or nasal closure in severe cases. Some people benefit from antifibrinolytic medications that help blood clot more effectively.

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Internal blood vessel malformations require specialized intervention based on their location and risk level.

Internal blood vessel malformations require specialized intervention based on their location and risk level. Pulmonary arteriovenous malformations larger than 3mm typically need treatment through embolization, where radiologists insert coils or plugs to close abnormal connections. Brain and spinal cord lesions may require surgical removal or stereotactic radiosurgery, depending on their size, location, and bleeding risk. These procedures carry their own risks, so doctors carefully weigh benefits against potential complications.

Surgical

Anemia from chronic bleeding often needs ongoing management through iron supplementation, dietary changes, or in severe cases, blood transfusions.

Anemia from chronic bleeding often needs ongoing management through iron supplementation, dietary changes, or in severe cases, blood transfusions. Some patients benefit from medications that reduce bleeding, such as tranexamic acid or hormonal therapies. Liver involvement may require monitoring and occasionally liver transplantation in severe cases with complications like heart failure.

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Emerging treatments show promise for the future.

Emerging treatments show promise for the future. Anti-angiogenic drugs like bevacizumab help some people by reducing blood vessel growth and bleeding. Research into gene therapy and other molecular approaches continues, though these remain experimental. The key to successful treatment lies in working with healthcare teams experienced in HHT, as the condition's complexity requires coordinated care across multiple specialties.

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Living With Hereditary Hemorrhagic Telangiectasia

Living successfully with HHT requires balancing vigilance with normalcy. Many people adapt well once they understand their condition and establish good healthcare relationships. Regular follow-up with HHT specialists helps monitor for new developments and adjust treatment plans. Keeping emergency information readily available, including details about internal lesions and bleeding risks, helps healthcare providers make informed decisions during urgent situations.

Daily life adaptations can significantly reduce symptoms and improve comfort.Daily life adaptations can significantly reduce symptoms and improve comfort. Simple strategies include: - Carrying tissues and knowing nosebleed first aid techniques - Using humidifiers and avoiding dry environments - Taking iron supplements as recommended - Staying hydrated and maintaining good nutrition - Planning activities around energy levels and bleeding patterns - Educating family and friends about the condition

Emotional support plays a vital role in managing HHT's psychological impact.Emotional support plays a vital role in managing HHT's psychological impact. Support groups, either in-person or online, connect people facing similar challenges. The HHT Foundation International provides resources, research updates, and advocacy support. Many people find that understanding their condition reduces anxiety about symptoms and helps them make informed decisions about treatment options. Working with healthcare teams experienced in HHT management makes a significant difference in both medical outcomes and quality of life.

Latest Medical Developments

Latest medical developments are being researched.

Frequently Asked Questions

Will my children definitely inherit HHT if I have it?

Each child has a 50% chance of inheriting HHT from an affected parent. The condition follows autosomal dominant inheritance, meaning only one faulty gene copy causes HHT. However, even if a child inherits the gene, their symptoms may be very different from yours in severity and timing.

Can I still exercise safely with HHT?

Most people with HHT can exercise safely, but recommendations depend on which organs are affected. Those with brain or spinal lesions may need to avoid high-impact activities or contact sports. People with lung involvement should work with their doctors to determine safe exercise levels and may need activity restrictions.

How often will I need medical screening?

Screening frequency varies based on your specific situation and which organs are affected. Most adults need brain and lung screening every 5-10 years, while children typically get screened once around age 12. Your HHT specialist will create a personalized monitoring schedule based on your individual risk factors.

Are there foods I should avoid with HHT?

There's no specific HHT diet, but maintaining good iron levels is crucial due to chronic blood loss. Focus on iron-rich foods and follow your doctor's supplement recommendations. Some people find that very hot or spicy foods trigger nosebleeds, so you might want to monitor your personal triggers.

Can HHT symptoms get worse with age?

HHT symptoms often become more noticeable with age, as blood vessel lesions can grow larger over time. However, the progression varies greatly between individuals. Regular monitoring helps catch changes early, and many symptoms remain manageable with appropriate treatment throughout life.

Is it safe for me to take blood thinners if needed?

Blood-thinning medications require careful consideration in people with HHT due to increased bleeding risks. However, they're sometimes necessary for other conditions like blood clots or heart disease. Your doctors will weigh the benefits against risks and may recommend alternatives when possible.

Should I wear a medical alert bracelet?

Many HHT specialists recommend medical alert jewelry, especially if you have brain or lung lesions that might affect emergency treatment decisions. Include your HHT diagnosis and any specific precautions, such as avoiding blood thinners or noting your increased stroke risk from certain procedures.

Can stress make HHT symptoms worse?

While stress doesn't directly worsen the underlying blood vessel abnormalities, it can trigger nosebleeds in some people and may affect overall health management. Learning stress management techniques and maintaining good self-care habits can help minimize symptom flares.

Will I need surgery for my blood vessel malformations?

Not everyone with HHT needs surgery. Treatment decisions depend on the size, location, and symptoms from specific lesions. Many small lesions are simply monitored, while larger or symptomatic ones might benefit from minimally invasive procedures like embolization rather than open surgery.

Can I travel normally with HHT?

Most people with HHT can travel safely with proper preparation. Carry medical information about your condition, ensure adequate iron supplements, and know how to manage nosebleeds. If you have brain lesions, discuss altitude considerations with your doctor, as cabin pressure changes might pose additional risks.

Update History

Apr 26, 2026v1.0.0

Published by DiseaseDirectory