Secretary of State Hillary Clinton was admitted to a hospital Sunday after doctors discovered a blood clot during an follow-up examination related to a concussion she suffered earlier this month.

Her spokesman, Philippe Reines, said Clinton is being treated with anti-coagulants at the New York-Presbyterian Hospital, where she will remain for the next 48 hours in order for doctors to observe her progress.

"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."

Clinton was also diagnosed with a blood clot in 1998. She would later describe the incident to the New York Daily News as "the most significant health scare [she'd] ever had."

When news of Clinton's concussion first broke two weeks ago, many conservatives were quick to question both the diagnosis and its timing, which coincided with Clinton's scheduled testimony about the attacks in Benghazi. Media Matters has a video rundown of the various Fox News pundits who attempted to spread conspiracy theories about the incident, and Buzzfeed has a list of eight people who thought the concussion was faked. There was also a Twitter hashtag game called "#HillaryProverbs," which several conservatives used, as recently as Saturday, to make "jokes" like "A concussion a day keeps congressional investigators at bay."

Clinton had been scheduled to return to work this week.

[Image via AP]