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A deep vein thrombosis (DVT) is a blood clot in a vein. Blood clots in veins most often occur in the legs but can occur elsewhere in the body, including the arms. This leaflet is about blood clots in leg veins. The most common cause of a blood clot developing in a vein is immobility.How serious is a DVT?
DVT stands for deep vein thrombosis, a blood clot in one of your body's deep veins, usually within a muscle of your leg. The biggest danger is that part of the clot could break off and travel to your lungs. It could cause a blockage known as a pulmonary embolism, or PE.