What causes a blockage in a blood vessel?

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A thrombus refers to a clot that forms within a blood vessel, which can lead to a blockage in the flow of blood. This clot is made up of blood cells, platelets, and fibrin and can develop in various types of blood vessels, including arteries and veins. When a thrombus forms, it can reduce or completely obstruct blood flow, potentially leading to serious conditions such as heart attacks or strokes, depending on the location of the blockage.

In contrast, an embolism is a piece of a thrombus or other material that has broken off and traveled through the bloodstream to lodge in a different location, which can also cause blockages but is not responsible for the initial formation. An aneurysm involves a weakening and bulging in a blood vessel wall, while a hemorrhage refers to bleeding that may occur inside the body or externally. Neither of these conditions directly causes a blockage in the same way that a thrombus does.