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Understanding Thrombophlebitis -- the Basics
What Is Thrombophlebitis?
Thrombophlebitis occurs mostly in the legs. It's a circulatory problem that develops when a blood clot slows the circulation in a vein, either right under the skin or deeper in the leg.
The name gives you a hint about what it is: "thrombo" means clot, and "phlebitis" means a vein with inflammation, or the swelling and irritation that happens as the result of an injury.
With thrombophlebitis (pronounced thrahm-bow-fleh-bye-tis), a blocked vein in the leg becomes swollen, irritated, and even hard to the touch. Most cases involving the shallow leg veins begin to resolve by themselves in a week or two. But in rare occasions, these blocked veins can lead to infection and tissue damage from the loss of healthy circulation.
When the deeper veins in the leg are involved, there are greater risks. A portion of the clot can break off and enter the bloodstream, travel far from the injury site and cause serious problems. If the clot reaches the heart or lungs and blocks circulation there, it can even cause death. In the more serious cases, people with thrombophlebitis need to be treated with drugs to "melt" the clot, lessen the swelling, and treat any infection that may develop.
What Causes Thrombophlebitis?
First, a blood clot forms, which can result from several causes -- most commonly from blood not moving the way it should through the legs. You could be sitting down for a long time in a place where you can't stretch out your legs, such as sitting on a long drive or airline flight. When blood sits still, it's more likely to form clots. Clots can also occur with extensive bed rest after surgery.
Varicose veins can cause thrombophlebitis, as well. The blood vessels are stretched out too much, allowing blood to pool in the vessel instead of streaming straight through in one direction, which can lead to blood clots.
People also can develop thrombophlebitis as a complication of intravenous tubes, or IVs. Hospital staffers try to lower this risk by changing the spots where IV lines are placed in the body, but thrombophlebitis still is possible. Pregnant women may also develop thrombophlebitis before or shortly after the baby is born.
Other risk factors include certain cancers, use of the hormone estrogen for birth control or hormone replacement, and a family history of blood clots.
WebMD Medical Reference
Reviewed by
Robert J Bryg, MD on October 24, 2010
© 2011 WebMD, LLC. All rights reserved.
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