The Psychogenicity of Havana Syndrome

Havana syndrome is a classic setup for an outbreak of mass psychogenic illness. Nobody seemed able to suggest how the mooted sonic attack device might actually work. Still, militaries don't tend to publicise their cutting edge technologies and some experts say it can't all have been psychogenic because a few people's symptoms were too serious for that. Whether an illness begins in the body or the mind, the symptoms are real. How do we treat them?