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Deep vein thrombosis (DVT) is a disorder in which a blood clot forms in one of the deep veins, usually in the legs. It can block normal blood flow and can be life-threatening if the clot breaks loose and travels to the lungs, producing a pulmonary embolism. DVT is typically linked to extended immobility, surgery, pregnancy, obesity, smoking, genetic clotting abnormalities, or certain medical illnesses, including cancer. Common symptoms include: Leg pain, swelling, warmth, tenderness, redness. However, some people may not have any symptoms at all. Early diagnosis is important to prevent major complications. Treatment typically involves anticoagulant drugs (blood thinners) to prevent clot formation and lower the risk of future clots.

Thrombolytic treatment, clot removal techniques, or inferior vena cava (IVC) filters may occasionally be advised. Compression stockings and frequent physical activity can assist in improving circulation and avoiding long-term consequences such as post-thrombotic syndrome. Prevention includes being active, maintaining a healthy weight, avoiding sitting for extended periods, and following physician recommendations after surgery or when traveling long distances. Most people do well with prompt treatment and appropriate follow-up, greatly reducing the chance of blood clots recurring.