Researchers from Oxford University in Berlin, who examined the records of half a million patients in the United States, found that people who had coronavirus were more likely to have a brain illness.
The BBC's Rachel Shray reports.
Research has looked at more than 14 of the most common conditions affecting the brain.
Almost all were seen more often in people who had a COVID infection in the previous six months.
Depression, dementia, and stroke have very different causes, and the study also says that will still be true among COVID patients.
They developed anxiety and depression at higher rates, most likely due to the stress, becoming very ill, and hospitalized.
But the Oxford team said the raised chances of people developing dementia and stroke after a COVID infection points to the virus having a direct effect on brain tissue and blood vessels.
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