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Long COVID brain fog may be due to damaged blood vessels in the brain

The result suggests there is a biological basis for this symptom

A foggy image of a woman with long, dark hair swept to the left.

Brain fog is a debilitating symptom commonly reported by people with long COVID. Now, scientists have linked the symptom to leaky boundaries in the brain.

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By Meghan Rosen

Leakiness in the brain could explain the memory and concentration problems linked to long COVID. 

In patients with brain fog, MRI scans revealed signs of damaged blood vessels in their brains, researchers reported February 22 in Nature Neuroscience.