Diagnosing dementia and Alzheimer's involves a careful medical evaluation, including a review of medical history, physical examination, and cognitive testing. While there's no single test for a definitive diagnosis, these evaluations help a practitioner determine if the symptoms are due to Alzheimer's or another form of dementia. Brain imaging tests can be used to rule out other causes of these symptoms, such as brain tumors or cancers. Imaging also helps doctors look for patterns of brain decline that are typical of Alzheimer's and other dementias.

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