HD Glossary

Note: Some words can have differing definitions depending on the context in which they are used. The definitions presented here are the ones that best apply to the words as they are used. HDSA is grateful to the Stanford Hopes website for their contribution and maintenance of this glossary.



  • Japanese knotweed - A plant that contains resveratrol, an antioxidant compound in red wine.
  • juvenile form - Another term for juvenile HD.
  • juvenile HD - Juvenile Huntington’s disease (juvenile HD) is a form of Huntington’s disease with an onset before age 20. Juvenile HD is caused by the same gene as the adult form of the disease, but its symptoms are different. Common symptoms include rigidity, seizures, and dementia. Also referred to as the juvenile form of HD, or early-onset HD. See Table E-1.