There is no clear line when one stage ends and another begins. In many cases, stages will overlap. Whichever staging system is used, or if none is used, it's important to remember that the disease affects each person differently. Alzheimer Disease is a progressive, degenerative disease of the brain where brain cells continue to die over time. There is no cure to stop the progression and eventually the body will shut down.
People usually die of secondary infection, such as pneumonia.
A comprehensive assessment needs to be done by a trained physician for the diagnosis of Alzheimer Disease to be made. The person's family doctor may be able to do this assessment. Or she may refer to a memory clinic or specialist, such as a geriatrician or neurologist. You can contact your local Alzheimer Society to find professionals in your community. Visit the Diagnosis page for more information on how the diagnosis is made.