“Alzheimer’s disease is a type of brain disease, just as coronary artery disease is a type of heart disease. It is also a progressive disease, meaning that it becomes worse with time. Alzheimer’s disease is thought to begin 20 years or more before symptoms arise.  It starts with changes in the brain that are unnoticeable to the person affected.

Only after years of brain changes do individuals experience noticeable symptoms such as memory loss and language problems.”

Alzheimer.org