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Disease guides

Stages of disease — clear, sourced guides (2026)

Plain-English guides to how progressive conditions advance, based on recognised clinical staging systems.

The 5 stages of Parkinson’s disease

Clear guide · the Hoehn & Yahr scale

The 7 stages of Alzheimer’s disease

Clear guide · the Global Deterioration Scale (Reisberg, 7 stages)

The 5 stages of chronic kidney disease

Clear guide · kidney function (eGFR) under the KDIGO system

The 4 stages of COPD

Clear guide · the GOLD grades (airflow / FEV1)

The 4 stages of ALS (motor neurone disease)

Clear guide · the King’s clinical staging system

The 3 stages of cirrhosis (liver scarring)

Clear guide · compensated vs decompensated (Child-Pugh)

The 4 stages of age-related macular degeneration (AMD)

Clear guide · the AREDS early / intermediate / late stages

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