What Is It?
Dementia is a pattern of mental decline caused by different diseases or conditions. Most commonly, dementia occurs when brain nerve cells (neurons) die, and connections between neurons are interrupted. These disruptions have a variety of causes and usually cannot be reversed.
Among the causes of dementia:
Other conditions that can cause dementia include:
In rare cases, dementia is caused by a treatable condition, and it may be partially or entirely reversed if the condition is diagnosed and treated early:
In the developed nations, about 15% of people older than 65 are thought to have dementia.
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