Here the stasis (slowing) of blood flow and swelling of the veins in the legs (whether visible as varicose veins or not) result in the development of clots in the leg veins. The blood backs up behind the clot, and then that blood also clots. When the condition is present in large, deep veins, it is particularly hazardous. Clots can break loose and travel through the circulation into the lungs; there they can cause a serious condition known as pulmonary embolism.
Prevention
The preventing program is identical to that for controlling problems with varicose veins. Exercise helps stimulate the blood flow; obesity makes it worse. Support hose can help. Smoking causes a substantial increase in the likelihood of forming clots. If you have already have one or more episodes of thrombophlebitis, the veins will have sustained damage, and the likelihood of recurrence is greater; blood-thinning medications may be required to help prevent future episodes.
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