What causes the Anomalous Health Incidents (Havana Syndrome) — a directed-energy weapon, environmental/biological factors, or psychogenic/social spread?
No material change. The Wikipedia article reviews multiple investigations but concludes no cause has been established. It notes that a 2023 review attributed the syndrome to a moral panic and psychogenic causes, while a 2024 review states the cause remains unknown and does not endorse a specific explanation. These updates do not resolve the competing explanations.