In a nutshell, dementia is a symptom, and AD is the cause of the symptom. When someone is told they have dementia, it means that they have significant memory problems as well as other cognitive difficulties, and that these problems are severe enough to get in the way of daily living.....

Too often, patients and their family members are told by their doctors that the patient has been diagnosed with “a little bit of dementia.” They leave the doctor’s visit with a feeling of relief that at least they don’t have Alzheimer’s disease (AD).

There is great confusion about the difference between “dementia” and “Alzheimer's disease.” The confusion is felt on the part of patients, family ...