A thrombus is most likely to occur in people who are immobile and in those with a genetic predisposition to blood clotting. A thrombus can also form after damage occurs in an artery, vein, or surrounding tissue. In this article, we look at blood clotting and the different types of thrombi.

Where does a thrombus occur?

Thrombosis occurs when blood clots block veins or arteries. Symptoms include pain and swelling in one leg, chest pain, or numbness on one side of the body. Complications of thrombosis can be life-threatening, such as a stroke or heart attack.

Where do blood clots mostly form?

Blood clots can arise anywhere in your body. They develop when blood thickens and clumps together. When a clot forms in a vein deep in the body, it's called deep vein thrombosis. Deep vein blood clots typically occur in the lower leg or thigh.