A thromboembolism is a blood clot that forms and then breaks off and travels through the bloodstream to another part of the body.
When a person is cut or injured, the blood clots, or clumps together. This helps to stop the bleeding. Blood may sometimes clot when it is not supposed to, however. For example, a blood clot may form inside a blood vessel or the heart.
A thromboembolism occurs when a blood clot breaks off from where it has formed and travels through the bloodstream. Eventually, the blood clot will get trapped inside a blood vessel that is too small to let it pass. Blood is then unable to flow through this vessel. The lack of blood flow can damage the body parts that normally receive blood from this vessel.
The blood clots that break off and form a thromboembolism can be caused by a number of disorders, including: