U.S. Secretary of State Hillary Clinton was hospitalized Sunday after doctors discovered a blood clot during a follow-up exam related to a concussion she suffered this month, her spokesman said. She is expected to remain at New York Presbyterian Hospital for the next 48 hours so doctors can monitor her condition and treat her with anti-coagulants, said Philippe Reines, deputy assistant secretary of state. "Her doctors will continue to assess her condition, including other issues associated with her concussion," Reines said. "They will determine if any further action is required." Reines did not specify where the clot was discovered, according to a report of CNN. Hillary Clinton, 65, was suffering from a stomach virus earlier this month when she fainted due to dehydration, causing the concussion. She spent the holidays with her family last week after working from home.