WASHINGTON — The same symptoms of a mysterious attack that sickened American diplomats in Cuba have been reported at a United States consulate in southern China, Secretary of State Mike Pompeo told lawmakers on Wednesday.

At least one American government employee in China recently reported what the State Department’s consulate in Guangzhou described as subtle and vague, but abnormal, sensations of sound and pressure.

“The medical indications are very similar and entirely consistent with the medical indications that have taken place to Americans working in Cuba,” Mr. Pompeo told the House Foreign Affairs Committee.

He said medical teams were heading to Guangzhou to address what he described as one incident.

“We are working to figure out what took place, both in Havana and now in China as well,” Mr. Pompeo said.