Alzheimer’s disease, also known as senile dementia, is a type of dementia, but dementia is not necessarily Alzheimer’s disease.
Alzheimer’s disease is a progressive neurodegenerative disease with an insidious onset and may present clinically with memory impairment, cognitive decline, aphasia, apraxia, dysarthria, dysrecognition, executive dysfunction, and personality and behavioral changes.
Dementia is a syndrome caused by a slowly progressive brain disease, which is characterized by memory loss, personality and interest changes, and voice dysfunction. Dementia and Alzheimer’s disease cannot usually be considered the same disease; Alzheimer’s disease is only one type of dementia, and dementia is not necessarily Alzheimer’s disease.