Blood clots can form in the legs if a patient has been resting for a long period of time. The clots can become deadly if they travel.
"The clot can break free and circulate through the blood and lodge in the lung, something called a pulmonary embolism," said Dr. Michael DeGeorgia with University Hospitals Case Medical Center.
While the location of Hillary Clinton's blood clot has not been revealed, the Secretary of State suffered a concussion earlier this month and plenty of rest is key for recovery.
Doctors now have her on blood thinners and will monitor her for 48 hours while her body tries to break down the clot. "They are helping to prevent new clots from forming, and they are
helping prevent the clots that are there from getting bigger," Dr. DeGeorgia said.
Prolonged bed rest is not the only risk factor for blood clots, sitting for long periods of time, being over age 60, pregnancy, and smoking can all increase your chances.
Clinton is also being monitored for other conditions related to her concussion. "Most commonly they have headaches, persistent headaches, sometimes patients can get dizziness, problems with balance, nausea," Dr. DeGeorgia said.
Doctors say depending on the severity of the concussion, symptoms can last a
couple of weeks.
Bigad Shaban - CBS News