Washington (CNN) -- U.S. Secretary of State Hillary Clinton sustained a concussion after becoming dehydrated and fainting, a State Department official said.
Clinton had been suffering from a stomach virus at the time, according to a statement on Saturday from Philippe Reines, deputy assistant secretary of state.
She is being monitored by doctors and is recovering at home. She was never hospitalized, Reines said.
"At their recommendation, she will continue to work from home next week, staying in regular contact with Department and other officials. She is looking forward to being back in the office soon," Reines said.
Secretary Clinton had been scheduled to testify on Capitol Hill Thursday about the deadly attack in Benghazi, Libya, in September that killed four Americans, including the U.S. ambassador.
Jodi Seth, spokeswoman for Sen. John Kerry, Senate Foreign Relations Committee chairman, said in a statement that Clinton would not testify before that committee Thursday.
Clinton had been scheduled to testify Thursday before the House Foreign Affairs Committee on the deadly attack in September on the U.S. consulate in Benghazi, Libya.
But she is not expected to appear at that time because of the health issue. That committee has not yet issued a statement.
The September 11, 2012, attack resulted in the deaths of four Americans, including Ambassador Chris Stevens, and called into question the security of U.S. diplomatic personnel abroad.