Dementia diagnoses are expected to surge in the coming decades, with Americans over 55 facing a 42% lifetime risk. New research shows that psychiatric conditions such as depression, anxiety, and bipolar disorder can raise that risk dramatically — in some cases by as much as 90%.
The study, published in BMJ Mental Health, followed nearly 3,700 patients. It found that the more psychiatric disorders someone had, the higher their likelihood of dementia. One disorder increased risk, two doubled it, three quadrupled it, and four or more raised dementia risk elevenfold. Anxiety and mood disorders appeared to be the strongest drivers.
Experts suggest psychiatric conditions may be early warning signs of dementia rather than separate problems. While the study was observational, it highlights the importance of screening and early detection. For people living with mental health conditions, proactive monitoring could be a crucial step in protecting long-term brain health.
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