Alzheimer’s disease is a progressive condition that steadily worsens over several years. Because the disease affects everyone differently, experts measure its progress in stages. Most experts reference seven stages, though some simplify it to three: mild, moderate, and severe. It can be difficult to place a person in a specific stage because symptoms often overlap. Still, the breakdown works well as a guideline for an individual's progression through the disease.
The pace with which someone with Alzheimer's moves through the stages differs from person to person. Each symptom affects the individual gradually, and not everyone is affected by all of them. On average, an individual with Alzheimer’s lives four to eight years after diagnosis. However, they may live significantly longer, depending on their overall health and various other factors.
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