Add To Favorites Deep vein thrombosis occurs when a blood clot (thrombus) forms in one or more of the deep veins in the body, usually in the legs. What is Deep Vein Thrombosis? [responsivevoice_button] Deep vein thrombosis is a part of a condition called venous thromboembolism. Pathophysiology Although the exact cause of deep vein thrombosis remains unclear, there are mechanisms believed to […]