A blood clot's danger depends on where it is

Secretary of State Hillary Rodham Clinton, listens to a reporter ask a question during a news conference with African Union Chairperson Nkosazana Dlamini-Zuma, not seen, after their meeting at the Department of State in Washington, in this Nov. 28, 2012 file photo. Doctors treating Secretary of State Hillary Rodham Clinton for a blood clot in her head said Monday Dec. 31, 2012 that blood thinners are being used to dissolve the clot and they are confident she will make a full recovery. (AP Photo/Manuel Balce Ceneta, File)  

(AP) - Blood clots like the one that Secretary of State Hillary Rodham Clinton is being treated for can occur for a host of reasons. How serious a clot is depends on where it is and why it formed. Clinton's doctors say her clot was located in a vein between the brain and the skull behind the right ear.

WHAT THEY ARE: Blood pools and thickens into a clot after an injury or because of a heart problem, clogged arteries or other condition. Clots also can break off and travel to another part of the body.

WHERE THEY OCCUR: In leg veins (called deep vein thrombosis) or in blood vessels in the neck, brain or lungs. Leg clots are a common risk after someone has been bedridden. Clots are most dangerous when they travel to the lungs, a potentially life-threatening situation, or to the brain, where they can cause a stroke.

RISK FACTORS: High blood pressure, diabetes, birth control pills, pregnancy, stroke, recent surgery, prolonged sitting, circulation problems and heart problems — especially an irregular heartbeat called atrial fibrillation — raise the chances of developing a blood clot.

TREATMENT: Sometimes a blood thinner such as warfarin (Coumadin) is prescribed to allow the clot to dissolve by itself over time and prevent new ones from forming.

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