Introduction
A diagnosis of dementia can be frightening for those affected by the syndrome, their family members, and caretakers. Learning more about dementia can help. This booklet provides a general overview of various types of dementia, describes how the disorders are diagnosed and treated, and offers highlights of research that is supported by the National Institute of Neurological Disorders and Stroke and the National Institute on Aging, both part of the National Institutes of Health (NIH). Alzheimer’s disease (AD) is the most common form of dementia in those over the age of 65. As many as 5 million Americans age 65 and older may have AD, and that number is expected to double for every 5-year interval beyond age 65. But Alzheimer’s is only one of many dementia disorders; an estimated 20 to 40 percent of people with dementia have some other form of the disorder. Among all people with dementia, many are believed to have a mixed type of dementia that can involve more than one of the disorders.
