Rapidly progressive dementias (RPDs) are dementias that progress quickly, typically over the course of weeks to months, but sometimes up to two to three years. RPDs are rare and often difficult to diagnose. Early and accurate diagnosis is very important because many causes of RPDs can be treated.

Can dementia get worse suddenly?

Dementia is a progressive condition, meaning that it gets worse over time. The speed of deterioration differs between individuals. Age, general health and the underlying disease causing brain damage will all affect the pattern of progression. However, for some people the decline can be sudden and rapid.

How long can you live with rapid dementia?

The average rapid onset dementia life expectancy ranges from 3 to 13 years after the onset or diagnosis. However, dementia suffers with rapid onset dementia may deteriorate much faster. Individuals with rapidly progressive dementia have an average life expectancy of 4 to 18 months after the time of diagnosis.