Preventing a deep vein thrombosis, also known as a DVT, is vital. A DVT is a blood clot that forms in the deep veins of the legs most commonly, but can also occur in the veins of the upper extremities. That's because the blood clot, which usually forms in a calf or thigh deep veins, can partially or completely block blood flow back to the heart and cause damage to the one-way valves in the veins. The clot can also break free and travel through your blood to major organs, such as your lungs -- which can be fatal. This is called a pulmonary embolism.
Doctors diagnose DVT in 600,000 Americans each year. One out of 100 of these people die. If you're at risk, there is much you can do to prevent DVT.