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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.
That can lead to many complications, including heart failure. People most at risk for DVT are those who've been on prolonged bed rest or otherwise unable to move their legs frequently, such as hospital patients, stroke victims and people with spinal cord injuries. Frequent movement of the leg muscles helps keep blood flowing through the veins.