Thrombosis is the formation of a blood clot, known as a thrombus, within a blood vessel. This can obstruct the flow of blood through the circulatory system. Thrombosis can occur in veins or arteries, leading to conditions such as deep vein thrombosis (DVT) or arterial thrombosis. These events can have serious health implications, including [pulmonary embolism](href), stroke, and myocardial infarction.