amxcoder writes: An American citizen working at a U.S. consulate located in the Chinese city of Guangzhou has reported experiencing "abnormal" sounds (and pressures) for the past several months, starting in late 2017 until April of 2018. Upon medical evaluation, the worker has been diagnosed with mild traumatic brain injury symptoms. The U.S. embassy is conducting an investigation into the issue, and is issuing warnings to all U.S. citizens in China. The symptoms and several other similarities has drawn comparison to a similar event last year in a different U.S. embassy in Cuba. Officials can not link the two events together at this point, but the U.S. State Department is working with Chinese authorities to investigate the issue further. As a result of the Cuba acoustic "attacks," the U.S. government in October expelled 15 Cuban diplomats from the U.S. for what it said was Cuba's failure to protect staff at the U.S. embassy in Havana. Staff there reported symptoms including hearing loss, dizziness, fatigue, and cognitive issues. Canadian personnel also reported similar health symptoms.