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Deep vein thrombosis (DVT) occurs when a blood clot forms in a deep vein in the leg or arm. There are two types of veins in the leg: superficial veins which lie just below the skin and can be seen on the surface, and deep veins which lie deep within the leg muscles.
What DVT is. Deep vein thrombosis (DVT) is a blood clot that develops in the deep veins of the body. It is also sometimes called venous thromboembolism (VTE). Clots are most likely to form in the thigh, lower leg or in the area between the hipbones (the pelvis).A blood clot can block the normal flow of blood through the veins.f you have cancer you may be at higher risk of developing a blood clot because of. 1  The cancer and its treatment. 2  Damage to the blood vessel walls. 3  Having less chemicals that thin the blood. 4  The type of cancer you have. 5  Being less active. 6  Other factors.