Blood clots are clumps formed when blood coagulates. Such clots have different names, depending on where they are located and how they formed.

A blood clot that forms in a blood vessel or in the heart and does not move to another area of the body is called a thrombus, according to the U.S. National Library of Medicine. If the clot forms in a vessel or the heart but moves to another part of the body, it is called an embolus.

Blood clots can cause complications by attaching to the wall of a blood vessel and blocking the flow of blood to or from that vessel. Such a blockage prevents surrounding tissues from receiving necessary blood and oxygen, which can permanently damage or even kill those tissues.

source: http://health.yahoo.com

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