Deep vein thrombosis (DVT) is a blood clot in one of the major deep veins, usually of the lower legs, thighs, or pelvis. A clot blocks blood circulation through these veins, which carries blood from the lower body back to the heart. The blockage can cause pain, swelling, or warmth in the leg. Blood clots in the veins can cause inflammation called thrombophlebitis. If the clot breaks loose and travels through the bloodstream, it can block a blood vessel in the lungs. Called pulmonary embolism, this can lead to severe trouble breathing and even death.
In the U.S., between 300,000 and 600,000 people per year get deep vein thrombosis. About 100,000 people die each year from pulmonary embolism.
DVT stands for deep vein thrombosis, a blood clot in one of the body’s deep veins, usually deep within the leg. The biggest danger of DVT is that part of the clot could break off and travel to the lungs, where it can cause a blockage known as a pulmonary embolism, or PE, says Marc Passman, director of the vein program at the University of Alabama at Birmingham. Your doctor will talk to you about how much of a risk your clot poses.