Why do some people experience cognitive impairment after recovering from COVID-19?

Cognitive impairment, or 'brain fog', is one of the main symptoms of long COVID. And the number of people experiencing this debilitating condition is still unknown.

A patient who had severe Covid-19 is discharged from a hospital in Italy. Source: Getty / Marco Mantovani/Getty Images

A new study published by Nature Medicine has examined several biomarkers, or substances in our blood, that help diagnose people with long-term COVID.

Those experiencing the condition welcome the new research, as they suffer from a disease that is often described as an invisible disease.

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