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Living with Pili torti-deafness syndrome

A rare condition that causes brittle, twisted scalp hair and hearing loss from early childhood.

Understanding Pili torti-deafness syndrome

Pili torti-deafness syndrome, also called Bjornstad syndrome, is a rare condition that causes abnormal hair and hearing loss.

The hair is twisted under the microscope (pili torti), brittle and breaks easily, so it is short and grows slowly. It usually affects only scalp hair and often begins before age 2. It may get milder with age, especially after puberty. Hearing loss from the inner ear shows up in early childhood and can range from mild to severe.

Signs & symptoms

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

  • Brittle, twisted hair (pili torti)
  • Hearing loss from the inner ear
  • Hair loss (alopecia)
  • Fine hair
  • Missing or thin eyebrows
  • Sparse body hair

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 brain and nervous system specialists, genetic specialists and skin, hair, and nail specialists.

  3. Consider genetic testing

    Changes in BCS1L 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

    United Mitochondrial Disease Foundation and MitoAction may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists); Skin, hair, and nail specialists (dermatologists)
Expert care
Expert lists: United Mitochondrial Disease Foundation, MitoAction
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 United Mitochondrial Disease Foundation 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
Should we have genetic testing for BCS1L?
How often should hearing be tested, and what hearing support is available?
Will the hair change as my child grows older?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Recessive, Mitochondrial
GenesBCS1L

Changes in the BCS1L gene cause this condition. GARD lists autosomal recessive and mitochondrial inheritance. Autosomal recessive means a child inherits a changed copy of the gene from each parent.

GeneticNeurologicalSkinInherited MetabolicMitochondrial

Also known as: bjornstad syndrome; bjornstad's syndrome; bjs; björnstad syndrome; deafness-pili torti-hypogonadism syndrome; deafness, pili torti, hypogonadism syndrome

Patient organizations

Source: NIH GARD · Pili torti-deafness syndromeGARD ID 22 · 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 Pili torti-deafness syndrome.

Explore the Pili torti-deafness syndrome blog

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