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By Tanya Basu
August 25, 2015

More than 46 million people around the world suffer from dementia, according to a report released Tuesday.

The World Alzheimer Report, published by Alzheimer’s Disease International and King’s College London, says the number of people affected by dementia has increased quickly from the 35 million estimated in 2009, and researchers warn that number could double in the next 20 years.

Dementia is a collective term for progressive, degenerative brain syndromes affecting cognitive functions. Alzheimer’s disease is a common cause of dementia.

The report also noted that 58% of all people with dementia reside in developing countries. By 2050, 68% of those with dementia will be located in low and middle income countries, where services are limited and populations are aging quickly.

There is no cure for dementia.

Write to Tanya Basu at tanya.basu@time.com.

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