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< Deep vein thrombosis is a blood clot that forms inside a vein, usually deep within your leg. About half a million Americans every year get one, and up to 100,000 die because of it. The danger is that part of the clot can break off and travel through your bloodstream. It could get stuck in your lungs and block blood flow, causing organ damage or death.Symptoms

Notice how the leg on the left here is swollen below the knee. That's a common symptom of DVT. So are redness and tenderness or pain in the area of the clot. But you won't always have these. Unfortunately, about half of people with DVT get no warning signs.
Pulmonary Embolism

This is a clot that moves into your lungs and blocks the blood supply. It can cause trouble breathing, low blood pressure, fainting, a faster heart rate, chest pain, and coughing up blood. If you have any of these, call 911 and get medical care right away.What Causes DVT?

Anything that damages the inner lining of a vein may cause DVT -- surgery, an injury, or your immune system. If your blood is thick or flows slowly, it's more likely to form a clot, especially in a vein that's already damaged. People who have certain genetic disorders or more estrogen in their system are more at risk for blood clots, too.

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