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What causes Alzheimer's disease?

For the majority of cases, it is not known why some people develop Alzheimer's disease. Most cases are not caused by known changes in genes. People with Alzheimer's disease have been shown to have abnormal levels of the proteins amyloid and tau, which build up and damage connections between neurons, with the neurons eventually dying and the brain shrinking.2817

Answered on 18 May 2018. Medically reviewed by Health&

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