Dementia
Dementia is a broad category of brain diseases that cause a long-term and often gradual decrease in the ability to think and remember that is severe enough to affect daily functioning. Other common symptoms include emotional problems, difficulties with language, and a decrease in motivation. Consciousness is usually not affected. A diagnosis of dementia requires a change from a person's usual mental functioning and a greater decline than one would expect due to aging. These diseases have a significant effect on caregivers.
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