adult-onset By Ivan Suarez Robles 13 Nov, 2010 Referring to when the symptoms of the disease strike (onset) in adulthood, as opposed to juvenile HD.Related Articles: A Case Study: Pregnancy and Symptomatic Huntington DiseaseHelp4HD Second Annual SymposiumHelp4HD International 2016 SymposiumHD in JapanUpdates in HD Research: January-March 2020