atrophy By Ivan Suarez Robles 13 Nov, 2010 Degeneration or shrinking of cells, tissues, or organs. Muscle atrophy causes muscle weakness.Related Articles: Cerebrovascular and Blood-Brain Barrier Impairments in Huntington's Disease: Potential Implications for Its PathophysiologyHelp4HD Second Annual SymposiumHelp4HD International 2016 SymposiumParamedic Stem Cells Show Potential as a Treatment for Huntington’s Disease in Mouse StudiesUpdates in HD Research: October-December 2020