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Dementia has jumped from 19th to 5th as global cause of death.
A new set of global health estimates released this week highlights a staggering surge in dementia, which has climbed from the 19th leading cause of death globally in 2000 to the fifth in 2023.
According to the World Health Organization’s Global Health Estimates 2000-2023, published on October 2, total deaths from the disease have tripled over the last nearly quarter-century.
While the sheer volume of this increase is alarming, the WHO notes that the spike is driven by a complex mix of demographic shifts, public health successes, and better data.
Four factors driving the surge
The tripling of global dementia mortality is primarily attributed to four factors:
- Global population aging: More people around the world are living into their 70s, 80s, and beyond—the age brackets where the risk of Alzheimer’s disease and other forms of dementia rises exponentially.
- Overall population growth: The sheer expansion of the global population over the 23-year period has naturally increased the absolute number of older adults worldwide.
- The epidemiological transition: Historic successes in combating infectious, maternal, and neonatal diseases mean fewer people are dying young. For the first time, communicable diseases accounted for less than half of all deaths in low-income countries. This triumph, however, has allowed more of the global population to live long enough to develop noncommunicable chronic conditions like dementia.
- Improved diagnosis and certification: Greater global awareness, better clinical diagnostic tools, and more accurate cause-of-death reporting on death certificates have led to higher detection and recording of dementia compared to the year 2000.
A growing gap in healthy years
The rise of dementia illustrates a broader shift in global health: noncommunicable diseases now drive the vast majority of global mortality. They accounted for 74 percent of all deaths in 2023, up from 58 percent in 2000, and made up eight of the ten leading causes of death worldwide last year.
Global life expectancy reached 73.3 years in 2023, nearly matching the pre-pandemic figure of 73.4 years recorded in 2019. However, healthy life expectancy—the years people actually live in good health—lagged at 62.8 years.
This gap between living longer and living healthier is increasingly defined by cognitive and chronic decline.
“Living longer is one of the great achievements of public health,” said Dr. Alain Labrique, director of WHO’s Department of Data, Digital Health, Analytics and AI. “The next challenge is to ensure that those additional years are lived in good health, while health systems are equipped to respond to the changing needs of populations.”
Labrique noted that the figures are meant to steer policy, not just describe it. As the world ages, the data will give countries the evidence needed to reshape health systems around chronic care and dementia support.
You can dive deeper into the WHO report’s global mortality figures here.
