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Symptoms and Signs of Alzheimer's Disease FAQs

Doctor's Notes on Alzheimer's Disease FAQs

Alzheimer's disease is a progressive and fatal brain disorder that gradually destroys a person's memory and ability to learn, reason, communicate, make judgments and unable to do basic tasks of everyday living. Signs and symptoms are often listed in stages; however, the disease symptoms may overlap with many individuals. The number of stages depends on which researcher is reporting them; the most basic stages are three (early, middle and late).

  • Early – problems with memory loss
  • Middle or intermediate – begin to lose the ability to think and reason clearly, judge situations, communicate with others, understanding new information and some difficulties taking care of themselves
  • Late – personality and/or behavior changes, anxiety, agitation, paranoia, severe memory loss, delusions, loss of mobility and hallucinations – unable to care for themselves

What causes Alzheimer’s disease is not known. Two forms of the disease are known; familial and sporadic. The familial form is very rare; the second reason, sporadic, may be present at the raw from genetic studies and is the common form of Alzheimer’s disease.

Medical Author:
Medically Reviewed on 3/11/2019


Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.