Havana Syndrome: What We Know a Decade Later

October 9, 2026 - 18:58

More than ten years have passed since US diplomats and intelligence officers in Havana, Cuba, began reporting a strange cluster of symptoms. The first cases appeared in late 2016. People described sudden headaches, dizziness, ringing in the ears, and a sense of pressure in the head. Some said they heard a piercing sound before the symptoms started. The mystery gave the condition its name: Havana Syndrome.

Since then, similar reports have surfaced among US personnel in China, Russia, Austria, and other countries. The incidents have sparked intense debate inside the government and the scientific community. Some officials suspected a foreign adversary was using a secret weapon, perhaps a directed energy device. Others pointed to environmental factors, pre-existing conditions, or psychological stress.

Investigations by the CIA and other agencies have reached mixed conclusions. A 2023 intelligence assessment found that it was "very unlikely" a foreign power was responsible for the symptoms. Many scientists argue that mass psychogenic illness, also known as mass hysteria, remains the most plausible explanation. This phenomenon occurs when stress and anxiety spread through a tight-knit group, producing real physical symptoms without a physical cause.

Critics of that theory say it dismisses the suffering of patients and ignores evidence of brain changes found in some scans. The debate is far from settled. What is clear is that the people affected continue to deal with serious health problems, and the search for answers is still ongoing.