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Living with Huntington disease-like syndrome

A group of brain conditions that look like Huntington disease but are not caused by the usual Huntington gene.

Understanding Huntington disease-like syndrome

Huntington disease-like syndrome is a group of related brain conditions that resemble Huntington disease.

Four types are described: HDL1 through HDL4, and HDL4 is also called SCA17. Like Huntington disease, they cause uncontrolled movements, emotional problems, and loss of thinking ability that worsen over time. HDL1, HDL2, and HDL4 usually begin in early to mid-adulthood. HDL3 begins much earlier, usually around age 3 or 4.

Signs & symptoms

GARD doesn't list specific symptoms for this condition. Its summary describes:

  • Irritability and emotional problems
  • Small involuntary movements
  • Jerking or twitching movements (chorea)
  • Poor coordination
  • Trouble speaking and swallowing
  • Changes in thinking and reasoning

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 and genetic specialists.

  3. Ask which tests can help

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

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
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
Which type of Huntington disease-like syndrome do I have?
Which treatments can ease movement or mood symptoms?
Would genetic testing help our family?

Quick facts

Changes in genes (also called variants) cause these conditions. They occur in people with Huntington disease features who do not have a change in the gene usually linked to Huntington disease.

GeneticNeurological

Also known as: huntington disease phenocopy syndrome; huntington disease-like syndrome disorder

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Huntington disease-like syndromeGARD ID 20029 · 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 Huntington disease-like syndrome.

Explore the Huntington disease-like syndrome blog

Explore research for Huntington disease-like syndrome

Explore actively recruiting Huntington disease-like syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Huntington disease-like 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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