Normally, one-way valves in the veins keep blood flowing up toward the heart.
But a blood clot can form around a valve in a vein.
If red blood cells become trapped around a valve, a blood clot might form. This blood clot can stop the flow of blood in that vein.
Last Revised: December 28, 2011
Author: Healthwise Staff
Medical Review: E. Gregory Thompson, MD - Internal Medicine & Jeffrey S. Ginsberg, MD - Hematology
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