Many factors: such as inherited predisposition as in Alzheimer's Dementia , Vascular Dementia is caused by hardening of the arteries with decreased blood flow to the brain causing microvascular changes as in strokes, repeated blows to the brain as in those incurred in sports, boxing, football . Accidents causing concussions or traumatic brain injuries like explosions in war. Diseases like Parkinson's Disease
Answered 3/8/2015
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