Dementia is a general term for loss of memory and other mental abilities severe enough to interfere with daily life. It is caused by physical changes in the brain.
Alzheimer’s disease is the most common type of dementia, accounting for 50 to 70 percent of cases. Other causes of dementia are briefly discussed in this section.
Mild cognitive impairment – MayoClinic.com
Dementia with Lewy Bodies
Fron to temporal Dementia
Creutzfeldt-Jakob Disease (CJD)
Normal Pressure Hydrocephalus