Since 2016, a number of U.S. diplomats and federal employees have reported symptoms of a mysterious illness, the so-called Havana Syndrome.

The list of symptoms include hearing loud sounds, nausea fatigue, and dizzying migraines, among others.

The cause of this mystery illness is a source of curiosity, but it remains unknown.

Last year the State Department commissioned a study by the National Academies of Sciences for researchers to investigate Havana Syndrome.

NPR's Sarah McCammon spoke to Dr. David Relman, a Stanford professor who headed the investigation.

One possible cause their group came to was a form of microwave radiation that occurs in a pulsed or intermittent form.

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<div>What you need to know about “Havana Syndrome,” the mysterious illness affecting U.S. officials stationed around the world — and whether there’s anything the United States can do about it. </div><div><br></div><div>Read more:</div><div><br></div><div>“<a href="https://ww ... Show More

Havana Syndrome: Over 200 Cases Document...