Late-stage Alzheimer's Disease(severe) https://www.alz.org/alzheimers-dementia/stages Dementia-stage Alzheimer's Disease A disease at late stage where dementia symptoms are severe. Individuals lose the ability to respond to their environment, to carry on a conversation and, eventually, to control movement. They may still say words or phrases, but communicating pain becomes difficult. As memory and cognitive skills continue to worsen, significant personality changes may take place and individuals need extensive care. disease stage