Thrombophlebitis is phlebitis (vein inflammation) related to a blood clot or thrombus. When it occurs repeatedly in different locations, it is known as "Thrombophlebitis migrans". Causes, incidence, and risk factors Thrombophlebitis is related to a blood clot (thrombus) in the vein. Risk factors include prolonged sitting and disorders related to blood clotting. Specific disorders associated with thrombophlebitis include superficial thrombophlebitis (affects veins near the skin surface) ...
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... Sitting during a long flight or an automobile ride can cause swollen ankles and calves. The inactivity also increases your risk of thrombophlebitis in the veins of your legs. To help prevent a blood c...
Source: MayoClinic