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Her medical cause of death was hyponatraemic encephalopathy, acute hyponatremia and psychogenic polydipsia.

"By saying we all have psychogenic itching to some degree, we normalise it," she adds.

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.”