What are the 7 stages of dementia?

The 7 stages of dementia come from the Global Deterioration Scale, which maps decline from no impairment (stage 1), through very mild and mild changes, to moderate and severe dementia (stages 6 and 7). Many clinicians use a simpler early, middle, and late model, but both describe the same overall path.

The "7 stages" come from the Global Deterioration Scale, a framework doctors use to describe how Alzheimer's-type dementia tends to progress. It is a rough map, not a timetable. People move through it at very different speeds, and the stages often blur into one another.

The seven stages

1. No impairment. No noticeable symptoms.
2. Very mild decline. Occasional forgetfulness that looks like normal aging.
3. Mild decline. Others start to notice: word-finding trouble, losing objects, difficulty at work. This is around where mild cognitive impairment may be diagnosed.
4. Moderate decline (early dementia). Clear problems with memory, managing finances, and complex tasks. Dementia is usually diagnosed here.
5. Moderately severe decline (middle dementia). The person needs help with everyday activities like choosing clothes, and may be confused about time or place.
6. Severe decline. Extensive help is needed with daily care, personality and behavior changes are common, and the person may not recognize close family.
7. Very severe decline (late dementia). Loss of the ability to speak, walk, and eventually swallow, needing full-time care.

A simpler way to think about it

Many clinicians and families find the three-stage model, early, middle, and late (or mild, moderate, and severe), easier to use day to day. It covers the same ground: stages 1 to 3 are roughly the early period, 4 and 5 the middle, and 6 and 7 the late stage.

What the stages are for

Staging helps families understand what may be coming and plan for care, support, and difficult decisions. But no scale predicts your specific journey. Progression varies a lot by the type of dementia and the person, so use the stages as a guide, and let the doctor help you understand where things stand.

This is general information, not medical advice. Every situation is different, so talk to a doctor about yours.