Veins are divided into two: superficial and deep. The formation of clots in these deep veins circulating between the muscles in the arm and leg is called deep vein thrombosis (DVT). Deep vein thrombosis is a disease that can have dangerous and fatal consequences as it can cause pulmonary embolism, that is, the filling of the lung vein with clot. In addition, venous ulcer, defined as postthrombotic insufficiency, can also occur in the future.