Thrombosis is a blood clot, or thrombus, that forms within a vein in the body. Patients are at risk for a thrombosis if they are inactive for a long period of time (such as during a long airline flight or if they are suffering from a prolonged illness). In addition, damage to the blood vessels as a result of surgery or an injury can put patients at risk for clot formation.
Cancer and genetic problems that result in clotting abnormalities can also put patients at risk for thrombosis. Other risk factors include obesity, a history of heart problems, pregnancy, and the use of birth control pills.
What is a DVT?
A DVT is a clot that forms within a vein in the leg. Formation of a DVT within the legs can lead to leg swelling and aching. The leg can become quite painful when walking or when it is touched. In addition, the leg can feel warm or become red in color. A small blood clot in the leg may not cause any symptoms.
DVT can damage the vein and valves within the vein. When this occurs, there can be abnormal pooling of blood in the leg, chronic leg pain, fatigue, swelling, and possibly skin ulcers. Some form of this can occur in as many as 60-70% of patients with a DVT. These symptoms are called post thrombotic syndrome.