Despite this, the person may feel as if he or she is having memory lapses, such as forgetting familiar words or the location of everyday objects. He or she may still drive, work and be part of social activities. In the early stage of Alzheimer's, a person may function independently. Be aware that it may be difficult to place a person with Alzheimer's in a specific stage as stages may overlap. The stages are separated into three categories: mild Alzheimer's disease, moderate Alzheimer's disease and severe Alzheimer's disease. (Dementia is a general term to describe the symptoms of mental decline that accompany Alzheimer’s and other brain diseases.) The stages below provide an overall idea of how abilities change once symptoms appear and should only be used as a general guide. This time period, which can last for years, is referred to as preclinical Alzheimer's disease.
Changes in the brain related to Alzheimer's begin years before any signs of the disease. 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. The symptoms of Alzheimer's disease worsen over time, although the rate at which the disease progresses varies. However, not all people with MCI develop dementia. Mild cognitive impairment (MCI) can be an early stage of the disease continuum for Alzheimer's if the hallmark changes in the brain are present.
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