Alzheimer's disease is a progressive form of dementia that interferes with behavior, memory, and thinking. Dementia is a broader term for memory loss and cognitive deficits that interfere with daily activities of living.
Stage 1: No impairment
Stage 2: Very mild cognitive decline (may be normal age-related changes or earliest signs of Alzheimer's disease)
Stage 3: Mild cognitive decline (early-stage Alzheimer's can be diagnosed in some, but not all, individuals with these symptoms)
Stage 4: Moderate cognitive decline (Mild or early-stage Alzheimer's disease)
Stage 5: Moderately severe cognitive decline (Moderate or mid-stage Alzheimer's disease)
Stage 6: Severe cognitive decline (Moderately severe or mid-stage Alzheimer's disease)
Stage 7: Very severe cognitive decline (Severe or late-stage Alzheimer's disease)
Dementia is a decline in cognitive function. It may affect memory, thinking, language, judgment, and behavior. To be considered dementia, mental impairment must affect at least two brain functions. It may also cause personality changes.
Stage 1: No Impairment
Stage 2: Questionable Impairment
Stage 3: Mild Impairment
Stage 4: Moderate Impairment
Stage 5: Severe Impairment