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Blood clots are semi-solid masses of blood that, when they block an artery or vein, affect the legs, lungs, kidneys, and brain, among other organs, so, depending on their location and severity, they could be fatal. After forming, a clot can remain stationary (thrombosis), or block blood flow and break off (embolism). A venous thrombosis is a clot that forms in a vein, and in most cases it develops in the deep veins of the leg or pelvis; this is known as deep vein thrombosis. If the clot, or a part of it, breaks away from the site of formation and travels through the circulatory system, an embolism can occur. As for treatment, there are now anticoagulants, drugs that prevent the formation of clots or prevent their growth, promoting their dissolution. In this program, learn about how to prevent and treat clots.