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Start free with EleplanHereditary geniospasm
ORPHA:53372Disease
Also called Hereditary chin myoclonus · Hereditary chin-trembling · Familial trembling of the chin
What it is
A rare genetic tremor disorder characterized by recurrent episodes of involuntary tremor of the chin and lower lip due to isolated myoclonus of the mentalis muscle. Patients may present more severe symptoms such as tongue biting and psychological distress. Even though neurological abnormalities are not associated, occasional involvement of sleep disorders and other facial muscles have been described. Sporadic cases were also reported.
Key facts
- Age of onset
- Childhood
- Inheritance
- Autosomal dominant
- Classified as
- Disease
Signs and symptoms
These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.
ICD-10 codes
ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.
Related health topics
Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
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