![](https://www.geni.com/images/external/x_com_black_16.png?1721673225)
![](https://www.geni.com/images/facebook_white_small_short.gif?1721673225)
Alzheimer's disease (AD), also known as Alzheimer disease, or just Alzheimer's, accounts for 60% to 70% of cases of dementia. It is a chronic neurodegenerative disease that usually starts slowly and gets worse over time. The most common early symptom is difficulty in remembering recent events (short-term memory loss). As the disease advances, symptoms can include problems with language, disorie...