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Deep Vein Thrombosis (DVT)
A deep vein thrombosis (DVT) is a blood clot in the leg that does not travel to other parts of the body. Most DVTs occur in the veins in the calf, but they also can occur in the thigh and in the hip area. These blood clots usually begin in areas where the ability of the blood to clot is out of balance or where blood flow is stopped or decreased, for example when there is an injury to the blood vessel wall.

Early signs of a DVT are pain, swelling, warmth and redness in the area where the blood clot has formed.
Age is the leading risk factor for DVT. 

DVT can lead to post-thrombotic syndrome, another kind of vein blockage that interferes with blood flow. This complication, which occurs in up to two-thirds of people with DVT, causes pain, fluid build-up, change in skin color and skin ulcers. In addition, DVT can have more serious consequences. It can lead to a blockage of an artery in a lung (pulmonary embolism), which can be life-threatening. This occurs in about 10 percent of people who have DVT.