thrombosis
With thrombosis, a blood clot (thrombus) blocks a blood vessel, so that only little blood, if any, can flow through the vessel. Therefore, you must consult your doctor in case of any suspicion of a deep vein thrombosis. Blood clots form primarily in the veins of the legs and pelvis. These blood vessels collect the blood from the feet, the legs and the pelvis and transport it back to the heart. A deep vein thrombosis must be treated by a doctor immediately. The risk of a pulmonary embolism occurring is particularly high if the deep veins of the leg are affected. A thrombus in the affected vein becomes dislodged and is swept into the lung by the blood flow, where it can block a vessel. In contrast, if the same thing happens in one of the superficial veins in the legs, the clot first has to meander in the direction of the deep leg veins, which is less risky.
