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Living with Factor XI deficiency

A bleeding disorder, usually mild, with long bleeding after surgery or injury.

Understanding Factor XI deficiency

Factor XI deficiency is a disorder that can cause abnormal bleeding because of low levels of the factor XI clotting protein.

It is called partial or severe depending on the protein level. Most people have mild bleeding problems, and some have few symptoms. The most common feature is long bleeding after injury or surgery, especially in the mouth, nose, or urinary tract. Bleeding into muscles or joints generally does not occur.

Signs & symptoms

GARD describes these common symptoms in its summary:

  • Bleeding for a long time after surgery or injury
  • Frequent nosebleeds
  • Easy bruising
  • Bleeding gums
  • Blood-filled swellings (hematomas) after surgery
  • Heavy or long periods (menorrhagia)

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

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

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

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
Expert care
Ask about multidisciplinary care centers for rare conditions
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 rare disease patient organizations for support
  • 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
How should I prepare for surgery or dental work?
Do I need treatment before procedures?
Which specialist, such as a blood doctor, should manage my care?

Quick facts

Changes in genes cause low levels of the factor XI protein. GARD does not name the gene or how it is inherited.

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Factor XI deficiencyGARD ID 25180 · 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 Factor XI deficiency.

Explore the Factor XI deficiency blog

Explore research for Factor XI deficiency

Explore actively recruiting Factor XI deficiency studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Factor XI deficiency with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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