Dementia: Caring for Persons with Dementia Download PDF, 1.64MB, PDF Dementia affects the brain and typically progresses in 3 stages: mild, moderate and severe. Persons with dementia may experience changes in behaviour and face difficulties with the following: Learn new information and skills Remember new information or recall recent events Care for oneself Communicate his/her needs Problem-solve and make judgements [Please download the PDF file if you are unable to view the image below.]