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What Is Deep Vein Thrombosis (DVT)? A Plain-Language Definition

Deep vein thrombosis (DVT) is a blood clot in a deep vein, usually in the lower leg or thigh. It can also affect the pelvis or arm, and sometimes lead to a pulmonary embolism.
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Deep vein thrombosis (DVT) is a blood clot that forms in a vein deep inside the body. It most often affects the lower leg or thigh, but can also occur in deep veins in the pelvis or, less often, the arm. A clot can sometimes break loose and travel to the lungs, causing a pulmonary embolism (PE).

What makes a clot a deep vein thrombosis?

DVT describes where the clot forms: in a deep vein, not in a vein at or near the body’s surface. Most DVTs occur in the lower leg or thigh, though deep veins in the pelvis and sometimes the arm can also be affected. MedlinePlus and the Centers for Disease Control and Prevention (CDC) describe these locations.

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How is DVT related to pulmonary embolism?

DVT is one form of venous thromboembolism (VTE), a term that includes DVT and pulmonary embolism. If a clot breaks loose and reaches the lungs, it can cause a PE. This is a possible serious complication, not an inevitable result of every DVT. MedlinePlus explains the connection.

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What symptoms can occur, and what does not confirm DVT?

Possible signs in an affected leg or arm include swelling, pain or tenderness, warmth, and redness or other discoloration. These signs are not specific to DVT: other conditions can cause similar symptoms. The CDC reports that about half of people with DVT have no symptoms. CDC: About Venous Thromboembolism

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Symptoms or appearance alone cannot confirm a clot. Diagnosis requires special medical tests, which can include imaging such as duplex ultrasonography. CDC: Testing and Diagnosis for Venous Thromboembolism

When should someone seek medical care?

If you think you may have DVT, seek urgent medical assessment rather than trying to diagnose it yourself. In the UK, NHS guidance advises emergency care when DVT-like pain and swelling occur with shortness of breath or chest pain; emergency services and care pathways differ by country. NHS: DVT

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