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The U.N. concluded that the symptoms were the result of mass psychogenic illness, a form of social panic.

Some published reports have suggested that the symptoms were characteristic of "mass psychogenic illness," but the declassified report rejects that, finding that the AHIs "do not fit criteria for mass psychogenic illness."

No evidence was found to support the suspicions, and WHO said it appeared to be a “mass psychogenic illness.”

In this case they constitute a “mass psychogenic illness”—or, more colloquially, mass hysterias—that can move across the world quickly, usually through social networks.

“Human nature is to look for cause and effect,” says Robert Baloh, professor of neurology and head and neck surgery at UCLA’s David Geffen School of Medicine and co-author of Havana Syndrome, which argues that what took place in Cuba was a mass psychogenic illness.