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Doctors say it is possible that an Alzheimer's patient could progress to the point that damage from the disease to the centers of the brain that control breathing could cause death, but patients rarely get that far without an infection setting in.
Overview of disease progression. The symptoms of Alzheimer's disease worsen over time, although the rate at which the disease progresses varies. On average, a person with Alzheimer's lives four to eight years after diagnosis, but can live as long as 20 years, depending on other factors. Changes in the brain related to Alzheimer's begin years before any signs of the disease.