Thrombophlebitis is an inflammatory process, the formation of a blood clot that blocks one or more veins. Usually, this occurs in the legs, particularly in the thighs. Doctors classify a thrombophlebitis by how close the vein is to the surface of the skin. Deeper thrombophlebitides are typically more dangerous and have more serious complications. There are many causes for the condition and factors that increase the risk.
Experts classify thrombophlebitis in one of two ways, depending on how deep beneath the skin the issue occurs. If a blood clot forms and blocks a vein close to the surface, doctors refer to it as superficial thrombophlebitis. If the clot occurs deep within a muscle, it is deep vein thrombosis or DVT. Comparatively, DVT poses more danger because it increases the risk of other serious complications. If superficial thrombophlebitis occurs multiple times in different locations, some physicians refer to it as migratory thrombophlebitis or thrombophlebitis migrans.
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