Irish researchers discover underlying cause of ‘brain fog’ linked with long covid

A suspected underlying cause of ‘brain fog’ linked with long Covid has been discovered by researchers (Kirsty O’Connor/PA)

Researchers have discovered that leaky blood vessels, together with a hyperactive immune system may be the underlying cause of brain fog in people with long covid.

They suggest their discovery is important for the understanding of brain fog and cognitive decline – difficulty with thinking, memory or concentration – seen in some people with the condition.