The U.S. State Department issued a health alert Wednesday for its citizens in China in response to what it said was a recent report of a U.S. government employee in Guangzhou experiencing “subtle and vague, but abnormal, sensations of sound and pressure.”
The U.S. Embassy in Beijing said the employee was sent back to the United States for evaluation and diagnosed with a mild traumatic brain injury.
Wednesday’s alert said the U.S. government does not know the cause of the reported symptoms and has not received similar reports in other parts of China, but that it is taking the report seriously.
It advised anyone who experiences “unusual acute auditory or sensory phenomena accompanied by unusual sounds or piercing noises” to not seek out the source, but instead to move to a location where they are not present.
Last year in Cuba, the United States reported that some of its personnel and family members experience a range of symptoms, often after hearing an unusual sound, but the cause is still unknown.