Blood clots are clumps that occur when blood hardens from a liquid to a solid.
A blood clot that forms inside a blood vessel or within the heart and stays there is called a thrombus. A thrombus that breaks loose and travels from one location in the body to another is called an embolus. The related medical disorder is called an embolism. For example, an embolus that gets stuck in the lungs is called a pulmonary embolism.
Sometimes other materials can act like an embolus and block blood flow, including:
Thrombi and emboli can firmly attach to a blood vessel. They can partially or completely block the flow of blood in that vessel.
A blockage in the blood vessel prevents normal blood flow and oxygen from reaching the tissues in that location. This is called ischemia. If ischemia is not treated promptly, it can result in tissue damage, or death of the tissues in that area.
Clot; Emboli; Thrombi