Havana syndrome has stumped doctors across the globe for years. Despite news of mysterious attacks, evidence suggests mass psychogenic illness — more commonly known as mass hysteria — may be the true cause. However, “the symptoms are real, the result of changes in brain connections and chemistry. They can also last for years.”
https://theconversation.com/havana-syndrome-fits-the-pattern-of-psychosomatic-illness-but-that-doesnt-mean-symptoms-arent-real-167275
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