Deep vein thrombosis (DVT) develops when a blood clot, or thrombus, forms in one or more of the deep veins, typically in the legs. This condition may lead to symptoms such as leg pain or swelling, though in some cases, it can occur without any noticeable signs.

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xDVT is a blood clot in deep veins, often in legs, causing pain/swelling. Sometimes, no symptoms appear.