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What causes deep vein thrombosis (DVT)?

Several things may cause the blood in your deep veins to clot (deep vein thrombosis, or DVT). First, the lining of your veins may be damaged by a number of conditions, including surgery, a condition known as thromboangiitis obliterans, or a previous blood clot, making it more likely that another clot will form. Second, certain oral contraceptives, estrogen-replacement drugs, or estrogen therapy can cause blood to clot more readily. Third, the circulation in your veins may slow, usually as the result of prolonged sitting or bed rest while recovering from an injury or illness, causing blood cells to clump and form a clot. Finally, your blood may be thicker than normal. The medical term for this is hypercoaguability. This may be due to an abnormality of clotting factors in the blood (primary) or secondary to an underlying medical condition (such as cancer).

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.