Thrombosis is a medical condition characterized by the formation of a blood clot, known as a thrombus, within a blood vessel. This clot can obstruct blood flow, leading to complications in the affected area. Thrombosis can occur in veins, known as venous thrombosis, or in arteries, referred to as arterial thrombosis. The most common types of thrombosis include deep vein thrombosis (DVT), which typically occurs in the legs, and pulmonary embolism (PE), where a clot travels to the lungs. Risk factors for thrombosis include prolonged immobility, certain medical conditions, and lifestyle choices such as smoking and obesity.