Varicose veins are a type of vein disease. It occurs when the veins, which carry blood from the extremities back to the heart, fail. The pressure is too strong for the valves that guide the flow of blood through the vein up to the heart. When the valves fail, the blood cannot continue its journey and expands, changing its shape and size. This causes the blood to remain stagnate in the extremities and could potentially cause leg ulcers, neuropathy, and poor healing in the extremities, especially after hip or knee surgery. In severe cases, varicose veins can cause heart problems, develop into deep vein thrombosis (DVT) and/or blot clots, known as pulmonary embolisms (PE), which can be fatal. In a few words it can cause you death if you do not treat them correctly.