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Deep vein thrombosis - Symptoms and causes - Mayo Clinic

Deep vein thrombosis (DVT) occurs when a blood clot (thrombus) forms in one or more of the deep veins in your body, usually in your legs. Deep vein thrombosis can cause leg pain or swelling, but also can occur with no symptoms. Deep vein thrombosis can develop if you have certain medical conditions that affect how your blood clots.