A venous thrombosis is the formation of a blood clot inside a vein, which may be due to a problem with hypercoagulation, injuries to the vessel wall or a problem of ecstasy (stagnation) of blood. Two types of thrombosis and thrombophlebitis the flebotrombosis. The first is the formation of a clot within the vein without inflammation but great peelability, since it is poorly bonded to the vessel wall. Usually affects the deep venous system and can even cause a pulmonary embolism. For thrombophlebitis, usually attached to the vein wall and is clinically manifested as a palpable cord, hard, pain, heat and redness in the area of the affected vessel. The treatment in this case is usually based on anti-inflammatories or antibiotics. In patients in whom deep venous thrombosis affecting the system pierma (DVT), an emergency hospitalization is required because if it appears may cause a heart attack, a stroke or pulmonary embolism.