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Living with Bloom syndrome

An inherited condition with short stature, sun-sensitive skin, and a much higher chance of cancer.

Understanding Bloom syndrome

Bloom syndrome is an inherited condition with short stature, a rash after sun exposure, and a greatly increased chance of cancer.

People are usually smaller than 97 percent of others in height and weight from birth, and rarely exceed 5 feet tall. A butterfly-shaped red patch often appears across the nose and cheeks. Cancers can be of any type and tend to appear earlier in life, sometimes more than one type. Other features include a high-pitched voice, learning disabilities, and repeated infections in infancy. Men usually do not produce sperm.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Short stature and slow growth
  • Skin rash after sun exposure
  • Small lower jaw and narrow face
  • Repeated ear and lung infections
  • Insulin resistance
  • Higher chance of cancer

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 allergy and immune system specialists, blood and bone marrow specialists, bone and joint specialists and brain and nervous system specialists.

  3. Consider genetic testing

    Changes in BLM are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    Immune Deficiency Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Allergy and immune system specialists (allergists / immunologists); Blood and bone marrow specialists (hematologists); Bone and joint specialists (orthopedists or orthopedic surgeons); Brain and nervous system specialists (neurologists)
Expert care
Expert lists: Immune Deficiency Foundation
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 Bloom Syndrome 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
What cancer screening do I or my child need, and how often?
How can we protect the skin from the sun?
Should we talk with a genetic counselor about fertility and family planning?

Quick facts

Symptoms usually startduring Pregnancy and as a Newborn
InheritanceAutosomal Recessive
GenesBLM

Changes in the BLM gene cause this condition. It is autosomal recessive, which means a child inherits a changed copy of the gene from each parent.

GeneticNeurologicalSkinBlood

Also known as: blm; bloom-torre-machacek syndrome; bs - bloom syndrome; bsyn; congenital telangiectatic erythema syndrome

Patient organizations

Source: NIH GARD · Bloom syndromeGARD ID 915 · 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 Bloom syndrome.

Explore the Bloom syndrome blog

Explore research for Bloom syndrome

Explore actively recruiting Bloom syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Bloom syndrome 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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