Deep vein thrombosis (DVT)

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Definition

Deep vein thrombosis is a condition in which a blood clot (thrombus) forms in one or more of the deep veins in your body, usually in your legs. Deep vein thrombosis is a serious condition because a blood clot that has formed in your vein can break loose and travel to your lungs. This is called a pulmonary (lung) embolism. In severe cases, a pulmonary embolism can cause death. However, many instances of deep vein thrombosis disappear on their own.

Blood clots can also form in veins that are closer to the surface of your skin. But these clots — known as superficial venous thrombosis, phlebitis or thrombophlebitis — aren't typically dangerous because clots that form in the veins near the surface of the skin don't travel to your lungs.

Deep vein thrombosis — abbreviated DVT — can cause symptoms, such as leg pain, but often occurs without any symptoms. Deep vein thrombosis can have many causes, such as prolonged sitting or an inherited blood-clotting disorder that increases your risk of DVT. Recognize the symptoms and risk factors for deep vein thrombosis so that you can avoid serious complications of this disorder.

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Symptoms