Juvenile Onset HD

Juvenile Onset Huntington Disease (JHD) is a form of Huntington disease (HD) that affects children and teenagers. Huntington’s disease is a hereditary neurodegenerative disorder that is characterized by progressively worsening motor, cognitive, behavioral, and psychiatric symptoms. JHD is caused by a mutation of the huntingtin gene called a “CAG repeat expansion”. The mutation results in gradual neuronal degeneration in the basal ganglia of the brain, which is responsible for coordination of movements, thoughts, and emotions. As JHD progresses, other regions of the brain undergo neuronal degeneration with diffuse and severe brain atrophy that is comparable to late stage Alzheimer disease.


Presentation of JHD includes changes in personality, coordination, behavior, speech or ability to learn. Physical changes include rigidity, leg stiffness, clumsiness, slowness of movement, tremors or myoclonus. In comparison with adult HD, seizures and rigidity are common, and chorea is uncommon.

Predisposition and typical initial symptoms of Juvenile Onset HD include:
  • Positive family history of HD, usually in the father
  • Stiffness of the legs
  • Clumsiness of arms and legs
  • Decline in cognitive function
  • Changes in behavior
  • Seizures
  • Changes in oral motor function
  • Chorea in an adolescent
  • Behavioral disturbances

Onset and Progression

JHD usually has a more rapid progression rate than adult onset HD; the earlier the onset, the faster JHD progresses. Death often occurs within 10 years of JHD onset, as opposed to 10-25 years in adult onset HD.


There is no cure or treatment to stop, slow or reverse the progression of JHD. Medications may be prescribed to manage symptoms. A child psychiatrist or behavior management specialist may address behavior disorders. A speech language pathologist may evaluate communication and swallowing problems. A nutritionist may be consulted to address nutritional needs as the disease progresses. Assistive devices such as wheelchairs, helmets, and communication boards may be used for safety, and to improve quality of life.

It is suggested that you contact your closest HDSA Center of Excellence if you have reason to suspect a case of JHD.

Further Information & Assistance

To learn more, click on the links below to download PDF versions of informative and in-depth HDSA publications. To find HDSA resources in your area, CLICK HERE. To speak with someone about JHD contact our Helpline at 800-345-HDSA

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