New Insights into Alzheimer's DiseaseAbout This Hardback Alzheimer's disease (AD) is a chronic neurodegenerative condition. It is the leading cause of dementia. The major symptom of AD is the difficulty in remembering recent events. The course of the disease can be divided into four stages that are characterized by a progressive decline of cognitive and functional abilities pre dementia, early, moderate and advanced. A diagnosis of the condition is based on the history of the illness,