Dementia is not a single disease.  Dementia is a family of diseases that cause progressive memory loss, usually in older patients.  The most common cause of dementia is Alzheimer's disease.  Dementia is progressive, and while some treatments exist, their efficacy is only modest.  In addition to memory loss, patients frequently suffer personality and behavior changes. Dementia is common, affecting 3.4 million Americans as of 2002, and this number is sure to increase as our population ages. The ...