Welma Geldenhuys the Senior Social Worker: Association for Dementia and Alzheimer’s disease South Africa speaks to POWER Weekend Breakfast host Tshego Moagi about Alzheimer’s disease and other types of dementia. Alzheimer’s disease and other types of dementia all affect memory, behavior, and communication. But dementia is a general term for these symptoms, while Alzheimer’s is the most common type of dementia that worsens with time.