Though very similar in many ways to Alzheimer's disease, multi-infarct dementia (MID) differs importantly in that it is caused by:

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Multi-infarct dementia (MID) is caused by multiple small strokes which result in the loss of blood supply to different parts of the brain. This leads to damage in the affected brain regions and can result in symptoms similar to those seen in Alzheimer's disease. Excessive alcohol intake can cause alcohol-related dementia, but this is a different condition. Abnormalities in metabolism can lead to other types of dementia, but not MID. Traumatic brain injury can also cause dementia, but this is not the primary cause of MID.

Though Very Similar in Many Ways to Alzheimer's Disease, Multi-Infarct