Veins are blood vessels that carry blood from organs back to the heart. They are still at risk of inflammation or damage when impacted, affecting the body's ability to move or sometimes endangering life.

Venous thromboembolism is a disease with very few warning symptoms, so most patients only discover the disease when it is in the late stages. If not treated promptly, it will cause the risk of pulmonary embolism and lead to death. Venous thromboembolism can happen to anyone, at any age.