Dementia isn’t one disease.  Like cancer, dementia is a family of different diseases that have important similarities.  The diseases that cause dementia all lead to progressive memory loss and brain dysfunction.  Dementia is caused by Alzheimer’s disease, vascular dementia, Parkinson’s disease and several other rarer brain disorders.  The different diseases that cause dementia cause different symptoms initially and have different treatments.  But unfortunately all the treatments are temporary an...