Hillary Clinton, seen here in file footage, was admitted to a New York hospital in Sunday with a blood clot.<br/> <br />The U.S Secretary of State is said to have developed the clot after a concussion when she fainted earlier in December.<br/> <br />She's being treated with anti-coagulants and was due to stay in hospital for 48 hours.<br/> <br />Clinton earlier this month cancelled an overseas trip because of a stomach virus.<br/> <br />Officials subsequently said her condition was improving and have played down suggestions it was anything more serious.
