Mr Reines, Clinton's spokesman, said Clinton is being treated with anti-coagulants - but he would not indicate where the blood clot is located.
Aides and doctors say Clinton contracted a stomach virus in early December and became dehydrated, then fainted, fell and hit her head on December 9.
She was diagnosed with a concussion on December 13 and hasn't been seen in public since.
Clinton's illness led her to cancel an overseas trip and scheduled testimony before Congress about the attack on the U.S. Consulate in Benghazi, Libya.
Earlier this week, The National Enquirer reported that brain cancer was behind Mrs Clinton's health problems and that she was facing a barrage of medical tests to confirm the diagnosis, but a spokesman for the 65-year-old Democrat labelled the claims "absolute nonsense" and insisted Clinton was recovering well from the fall and subsequent concussion.
We do not know what the truth, certain this evening on television they have a transmission of almost 2 hours on this fact and it seemed more a commemoration of a person about to die that it want to give a brief report.
We want to wish Hilary in any case that everything can be solved well for her as a person, not as as former Secretary of State or as a former First Lady or ... or ...
Come on Hilary! Show us your strength! Happy New Year 2013!
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