"Dementia is the loss of cognitive functioningthinking, remembering, and reasoningand behavioral abilities to such an extent that it interferes with a person"s daily life and activities. These functions include memory, language skills, visual perception, problem solving, self-management, and the ability to focus and pay attention. Some people with dementia cannot control their emotions, and their personalities may change. Dementia ranges in severity from the mildest stage, when it is just beginning to affect a person"s functioning, to the most severe stage, when the person must depend completely on others for basic activities of living.
Signs and symptoms of dementia result when once-healthy neurons (nerve cells) in the brain stop working, lose connections with other brain cells, and die. While everyone loses some neurons as they age, people with dementia experience far greater loss.
While dementia is more common as people grow older (up to half of all people age 85 or older may have some form of dementia), it is not a normal part of aging. Many people live into their 90s and beyond without any signs of dementia. One type of dementia, frontotemporal disorders, is more common in middle-aged than older adults.
The causes of dementia can vary, depending on the types of brain changes that may be taking place. Alzheimer"s disease is the most common cause of dementia in older adults. Other dementias include Lewy body dementia, frontotemporal disorders, and vascular dementia. It is common for people to have mixed dementiaa combination of two or more types of dementia. For example, some people have both Alzheimer"s disease and vascular dementia."
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