Deep vein thrombosis (DVT) is a blood clot in one of the deep veins of your body, usually in your leg.

If not treated, there is a risk that part of the blood clot may become dislodged and travel through your bloodstream to your lungs, where it can get stuck and block the flow of blood. This is called 'pulmonary embolism' and is a life-threatening condition.

DVT symptoms include swelling, pain and tenderness in your leg.

If you think that you may have DVT, see your doctor immediately. If you have pain in your lungs or chest or difficulty breathing, contact your doctor immediately or go to a hospital emergency department.

To find out about the causes, diagnosis, treatment and management of DVT, use the navigation bar at the right of this page.