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
Browse condition stages
- The 4 stages of ALS (motor neurone disease): a clear guide (2026)
- The 7 stages of Alzheimer’s disease: a clear guide (2026)
- The 5 stages of chronic kidney disease: a clear guide (2026)
- The 3 stages of cirrhosis (liver scarring): a clear guide (2026)
- The 4 stages of COPD: a clear guide (2026)
- The 4 stages of age-related macular degeneration (AMD): a clear guide (2026)
- The 5 stages of Parkinson’s disease: a clear guide (2026)