Huntington Disease
Huntington Disease
Huntington's disease is a rare autosomal dominant neurodegenerative disease, characterized primarily by involuntary choreiform movements, psychiatric symptoms, and progressive cognitive decline.
Start Here
A quick guide to the next step: which department to start with, what to prepare, and what to ask.
Start with a neurologist; psychiatry may be added if significant psychiatric symptoms occur; genetic testing and genetic counseling should be done under specialist guidance; rehabilitation medicine can help if motor dysfunction develops.
This is a neurodegenerative disease caused by abnormal expansion of CAG trinucleotide repeats in the HTT gene on chromosome 4. Neurons in the striatum (caudate nucleus and putamen) selectively die, leading to motor, psychiatric, and cognitive symptoms.
Current management focuses on symptom control, rehabilitation, swallowing and nutrition safety, psychiatric and psychological support, care planning, and genetic counseling. Gene-related therapies should be verified through clinical trials and regulatory-approved information.
Autosomal dominant inheritance means inheriting one mutant copy from either parent can cause the disease. Offspring have a 50% chance of inheriting the mutation. Paternal transmission tends to result in earlier onset. Individuals with family planning goals should discuss genetic counseling and reproductive options.
Early symptoms vary greatly between individuals and may be mistaken for anxiety, depression, or obsessive-compulsive disorder. Mild choreiform movements early on may be overlooked or dismissed as habitual movements. Cognitive decline is often attributed to work stress or normal aging.
This page helps patients and families organize care leads. It does not replace a clinician’s diagnosis or treatment plan. For testing, medication, referrals, emergency care, and support applications, follow qualified clinicians, medical institutions, support organizations, and official sources.
Diagnosis Path
Organized around the practical patient journey: identify clues, avoid common delays, then prepare for care.
When to Suspect It
- Unexplained involuntary movements of the face or limbs (such as eye twitching, lip pursing, or limb jerking).
- Family members notice significant changes in mood, personality, or symptoms of depression and impulse control problems.
- Declining memory and reduced efficiency at work or in daily activities.
- Family history of Huntington's disease with any of the above symptoms or just a feeling of reduced agility.
Common Wrong Turns
- Treating only with psychiatric diagnosis (depression, anxiety) while overlooking the combination of choreiform movements and cognitive decline.
- Misinterpreting movement abnormalities as epilepsy or other movement disorders.
- Ruling out hereditary neurodegenerative diseases without understanding the family history.
Departments to Start With
- Neurology
- Psychiatry (when prominent psychiatric symptoms occur)
- Rehabilitation Medicine (for motor and speech support)
- Genetic Counseling (for genetic assessment and family screening)
Before the Visit
- Detailed neurological examination to assess the type and severity of choreiform movements.
- Blood routine and metabolic screening to rule out other causes.
- HTT gene CAG repeat number testing (repeat count >= 36 indicates a mutation carrier).
- Brain MRI or CT: characteristic caudate nucleus and putamen atrophy, enlarged lateral ventricles.
- Neuropsychological assessment: baseline cognitive function evaluation.
- Psychiatric evaluation: assessment of mood, behavioral, and personality changes.
Tests to Ask About
- What is my specific HTT gene CAG repeat count?
- What did my brain imaging show? Is there caudate nucleus atrophy?
- Is there cognitive decline, and what assessments are needed?
- Do my family members need genetic screening? How should this be arranged?
Questions for the Doctor
- What stage are the motor, cognitive, and behavioral symptoms at currently?
- Which symptoms need medication or rehabilitation intervention? What are the treatment goals and how are side effects monitored?
- How should swallowing, nutrition, fall prevention, and driving/work safety be assessed?
- Is predictive genetic testing appropriate for asymptomatic family members? What is the genetic counseling process?
Basic Information
Medical Notes
More complete medical explanations are kept here for discussion with clinicians.