March 5, 2007 -- Vice President Dick Cheney is being treated for a blood clot in his left leg, according to news reports.
DVTs are blood clots that form in veins deep in the body, usually in the lower leg or thigh. If a piece of a clot travels through the blood to the lungs, it can cause a potentially deadly pulmonary embolism (blood clot in the lungs). There is no sign of pulmonary embolism in Cheney's case.
DVTs can occur during periods of immobilization, such as bed rest, or sitting for long periods of time, such as on lengthy flights.
Cheney returned to the U.S. last week from an overseas trip to Afghanistan and Pakistan. But the cause of his DVT is not known.
Cheney is expected to maintain his regular schedule and "feels fine," Cheney spokeswoman Lea Anne McBride says in an Associated Press story.
He also has an implantable cardioverter defibrillator (ICD), a tiny implant that can shock an abnormal heart rhythm back to normal.
Cheney was treated briefly in January 2006 for shortness of breath and was released the same day from a Washington hospital.