Every Stage of Alzheimer’s Disease Explained — A Neurologist Walks Through All 7
More than 55 million people worldwide are living with Alzheimer’s disease or a related dementia. Every case progresses through seven clinically defined stages — from the silent biological beginning, decades before any symptom appears, to the final stage.
In this video, Dr. Mannu Jones walks through all seven stages in detail: what is happening in the brain at each stage, what the person is experiencing, and what the family and caregivers around them are going through.
This video was built for two audiences: people concerned about their own cognitive health, and the families and caregivers watching for someone they love.
What you will learn: Stage
1: Why Alzheimer’s begins 25 years before any symptom appears Stage
2: The stage that exists only for the person experiencing it Stage
3: The stage that gets dismissed — and why that costs years Stage
4: Diagnosis and the last window for critical decisions Stage
5: When consistent daily assistance becomes necessary Stage
6: Ambiguous loss, music, wandering, and sundowning explained clearly Stage
7: The final stage — what happens, what remains, what to expect The 2024 Lancet Commission finding: 45% of cases are potentially preventable
Chapters:
0:00 Why understanding all 7 stages changes everything
2:00 Stage 1: No Impairment — the silent beginning
5:00 Stage 2: Very Mild Decline — the private fear
8:30 Stage 3: Mild Decline — the stage that gets dismissed
11:30 Stage 4: Moderate Decline — diagnosis and the critical window
14:30 Stage 5: Moderately Severe — the stage of need
17:30 Stage 6: Severe Decline — ambiguous loss and what remains
20:30 Stage 7: Very Severe — the final stage explained
22:30 45% of cases are preventable — what the research actually says
24:00 What to do right now
Sources: Reisberg et al. — Global Deterioration Scale Bateman et al., 2012,
New England Journal of Medicine — DIAN study Livingston et al., 2024,
The Lancet — Lancet Commission on Dementia Prevention Jack et al., 2010,
The Lancet Neurology — biological staging of Alzheimer’s Alzheimer’s Association 2025 Facts and Figures
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Disclaimer: This video is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for personal medical concerns. This content is AI-assisted.
#alzheimersdisease #AlzheimersStages #dementiaprevention #brainhealth #alzheimersawareness #cognitivedecline #SeniorBrainHealth #memoryloss
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