Demen
It may run in some families, but the role of genes is less clear. Watch this video about: Alzheimer disease. The exact cause of Alzheimer disease is not known. Sign In Create Account. Sometimes, a PET scan can be used to rule out Alzheimer disease. Stay mentally and socially active. The only way to know for certain that someone has Alzheimer disease is to examine a sample of their brain tissue after death. The number of Americans with dementia who live in homes with guns could reach 12 million by
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