Huntington's disease, or Huntington's chorea, is a progressive genetic disease marked by death of brain cells coupled with loss of muscular control and coordination, declining mental abilities, and erratic behavior. Currently, this form of dementia has no cure. ""Huntington's Disease"" introduces this disease, detailing its history and progression, and discusses the search for the gene that causes it and the development of genetic tests for the gene. This title also addresses the ethical questions of testing people for a disease whose symptoms typically develop later in life.