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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.
Veins are the blood vessels that carry blood back to the heart. A clot in the deep veins of legs, arms, abdomen or around the brain is called deep vein thrombosis (also called DVT for short) . If a piece of clot from a leg or arm DVT breaks off it can travel into the lung, causing a pulmonary embolism (PE) .