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We studied how COVID affects mental health and brain disorders up to two years after infection – here’s what we found

August 20, 2022


The occurrence of mental health conditions and neurological disorders among people recovering from COVID has been a concern since early in the pandemic. Several studies have shown that a significant proportion of adults face problems of this kind, and that the risks are greater than following other infections.

However, several questions remain. Do the risks of psychiatric and neurological problems dissipate, and if so, when? Are the risks similar in children as in adults? Are there differences between COVID variants?

Our new study, published in The Lancet Psychiatry, explored these issues. In analyses led by my colleague Maxime Taquet, we used the electronic health records of about 1.25 million people diagnosed with COVID, mostly from the US. We tracked the occurrence of 14 major neurological and psychiatric diagnoses in these patients for up to two years.

We compared these risks with a closely matched control group of people who had been diagnosed with a respiratory infection other than COVID.

We examined children (aged under 18), adults (18-65) and older adults (over 65) separately.

We also compared people who contracted COVID just after the emergence of a new variant (notably omicron, but earlier variants too) with those who did so just beforehand.

Our findings are a mixture of good and bad news. Reassuringly, although we observed a greater risk of common psychiatric disorders (anxiety and depression) after COVID infection, this heightened risk rapidly subsided. The rates of these disorders among people who had COVID were no different from those who had other respiratory infections within a couple of months, and there was no overall excess of these disorders over the two years.

It was also good news that children were not at greater risk of these disorders at any stage after COVID infection.

We also found that people who had had COVID were not at higher risk of getting Parkinson’s disease, which had been a concern early in the pandemic.




Read more:
COVID: long-lasting symptoms rarer in children than in adults – new research


Other findings were more worrying. The risks of being diagnosed with some disorders, such as psychosis, seizures or epilepsy, brain fog and dementia, though mostly still low, remained elevated throughout the two years after COVID infection. For example, the risk of dementia in older adults was 4.5% in the two years after COVID compared with 3.3% in those with another respiratory infection.

We also saw an ongoing risk of psychosis and seizures in children.

A woman sits by a window, hiding her head.
Rates of depression and anxiety were higher after COVID, but only for a short time.
Stock Unit/Shutterstock

In terms of variants, although our data confirms that omicron is a much milder illness than the previous delta variant, survivors remained at similar risk of the neurological and psychiatric conditions we looked at.

However, given how recently omicron emerged, the data we have for people who were infected with this variant only goes up to about five months after infection. So the picture may change.

Mixed results

Overall, our study reveals a mixed picture, with some disorders showing a transient excess risk after COVID, while other disorders have a sustained risk. For the most part, the findings are reassuring in children, but with some concerning exceptions.

The results on omicron, the variant currently dominant around the world, indicate that the burden of these disorders is likely to continue, even though this variant is milder in other respects.

The study has important caveats. Our findings don’t capture people who may have had COVID but it wasn’t documented in their health records – perhaps because they didn’t have symptoms.

And we cannot fully account for the effect of vaccination, because we didn’t have complete information about vaccination status, and some people in our study caught COVID before vaccines became available. That said, in a previous study we showed the risks of these outcomes were pretty similar in people who caught COVID after being vaccinated, so this might not have significantly affected the results.

Also, the risks observed in our study are relative to people who had had other respiratory infections. We don’t know how they compare to people without any infection. We also don’t know how severe or long lasting the disorders were.




Read more:
How does COVID affect the brain? Two neuroscientists explain


Finally, our study is observational and so cannot explain how or why COVID is associated with these risks. Current theories include persistence of the virus in the nervous system, the immune reaction to the infection, or problems with blood vessels. These are being investigated in separate research.



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