Dementia Dementia describes a group of symptoms such as memory loss, impaired judgment, confusion and behavioural changes, which are severe enough to cause loss of function. [Please download the PDF file if you are unable to view the image below.] Download Chinese PDF, 934KB, PDF Content serves as a guide only. Seek the advice of your doctor for more details Information correct as of April 2020 Reproduced with permission from the National Neuroscience Institute (NNI)