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Living with Hereditary geniospasm

A movement condition that causes episodes of trembling in the chin and lower lip.

Understanding Hereditary geniospasm

Hereditary geniospasm is a movement disorder that causes episodes of involuntary shaking of the chin and lower lip.

Episodes can last from a few seconds to hours. They may happen on their own or be set off by stress. They usually start in infancy or childhood and tend to happen less often with age.

Signs & symptoms

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

  • Shaking of the chin (chin myoclonus)
  • Trembling of the lower lip
  • Episodes lasting seconds to hours
  • Episodes set off by stress

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
How can we tell this apart from other movement conditions?
What triggers episodes, and how can we manage stress triggers?
Should other family members be checked?

Quick facts

Symptoms usually startChild
InheritanceAutosomal Dominant

GARD says it is believed to be autosomal dominant, so one changed copy of the gene is enough to cause it. It doesn't name a gene.

GeneticNeurological

Also known as: chin myoclonus; chin spasms; familial trembling of the chin; geniospasm; geniospasm 1; hereditary chin myoclonus

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Hereditary geniospasmGARD ID 9501 · 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 Hereditary geniospasm.

Explore the Hereditary geniospasm blog

Explore research for Hereditary geniospasm

Explore actively recruiting Hereditary geniospasm studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Hereditary geniospasm with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
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  • 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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