US study finds no evidence of brain injury in cases of "Havana Syndrome"

The National Institutes of Health (NIH) in the United States conducted studies on US government employees who reported symptoms of "Havana Syndrome," which includes vertigo, headaches, cognitive dysfunction, and ear-ringing. However, NIH found no evidence that these symptoms were caused by any specific physical damage or alteration (NIH Study 1). The first reported cases emerged in 2016 among US officials, with symptoms such as hearing noise and experiencing head pressure followed by headaches, migraines, and dizziness. Dr. Leighton Chan, NIH's chief of rehabilitation medicine, acknowledged that these individuals experienced real and disabling symptoms. Neither study detected any significant differences between the affected group and a control group consisting of about 80 current or former US officials. Since then, hundreds of cases have been reported, primarily among US officials posted abroad.